First, click File" then hit Create Game. In the new window that opened up, select "Mode" and make sure "Host Server" is selected.

Next, click the folder icon next to the IWAD text box and browse to your Megaman 8-Bit Deathmatch directory, select megagame.wad.

After doing that, click "Browse" and go into your Megaman 8-Bit Deathmatch directory and select your "MM8BDM" pk3 file. Once more, select "Browse" and go to where your Team Cooperative pk3 is located and select it.

Finally, go into "Custom Parameters" and copy and paste these parameters into the text box:

The batch/bash file is the quickest but not the easiest method to launch the game, especially if you are not tech savy. For this method, create a .bat (or .sh if you are on Linux) file in your Megaman 8-Bit Deathmatch directory with these parameters. Add -private to the parameters if you don't want your server to be public.

Replace the files in brackets where your respective megagame, mm8bdm, and teamcoop files are located: e.g. "wads/teamcoop.pk3". After that launch your batch/bash file in your Megaman 8-Bit Deathmatch directory.

WARNING:
If you are using the server GUI that launches when hosting a server, I recommend that you join the server from the game itself instead of the GUI as I have noticed that there were times where save data would be lost after a session was finished. I believe this is due to the fact that improperly closing both the game and server window using ALT-F4 causes the save data corruption to happen but it has also happened to me randomly. The issue only stopped when I connected to the server from outside of the server GUI through the launcher

Just follow the instructions in this page to host a server. In the additional parameters section for your server provider, copy and paste these settings:

Made some corrections to Duo's dialogue in the Evil Robot cutscene and the last letter.
The admin menu now saves your previous option when exiting and opening the menu.
If an admin action is in progress (kick or ban), it will no longer be cancelled upon dying.
HP scaling has been disabled for the Yellow Devil.
Fixed a major issue with the Ra Moon fight relating to an infinite loop with the Ra Moon attack and Ra Moon minions randomly becoming invincible and not despawning after the summon phase.

New additions and changes:
Added an admin menu which can be accessed with "adminmenu"
Added an operator status which can be set with giveop. Operators have more power than regular admins and can kick and ban admin players.
Only 1 player is required to look at Wily during the pre-Fakeman cutscene.
You can now skip the Award Ceremony cutscene, Wily Golem ending, and the first two cutscenes before Eclipse.
Metall Daddy's wave has been made smaller in multiplayer, allowing players to dodge it.
Buildings will now spawn properly for all players during the Eclipse fight.
Boss health scaling has been added. 50+ points will be added to the boss's health for every subsequent player that joins the game. Some major bosses, however, are not affected. These bosses are: Darkman Troopers, Gamma, Evil Robot, Genesis Unit, Wily Golem, Weapons Archive, and Eclipse.
Boss rotations for the Evil Robot have been added with help from VariableX.
Boss Attack now uses a separate map instead of the hub, which should help prevent potential bugs during map changes in multiplayer.
The Evil Robot will now target random players before selecting an attack.
The teleporter in the Doc Robot cutscene will now teleport all players.
For each phase of the Mega Shark, a random player will now move to the new position.
The V6 ending has now been changed to include the rest of the players.
All direct NPC dialogue in MAP02 will no longer chime for other players.
All players will now face parts of the Mega Shark correctly after transitioning to a phase.
Immersion fixes were made for the cutscenes in the Copy Robot, Bass, Protoman, and Wily Golem fights, making it much closer to vanilla.
The player infected during the Roboenza cutscene will always be the lead player unless they've disconnected, to which the next player infected will be random.
NPCs can now be interacted with while important dialogue is active.

Text and dialogue changes:
The default team name has been changed from the "Maestro 8" to the "Mystery Numbers".
Changed a line in Bass's dialogue when defeated from "Even Together" to "Even as a Team".
Made a small dialogue change to the pre-Fakeman, Evil Robot, and pre-Sunstar cutscenes.
The player titlebar during the Eclipse is changed from "Current Player" to "Current Turn" which should better specify that who's turn it is during the fight.

Visual changes:
The Rush actor has been changed to display correctly during the Mega-Shark fight. Now there should be no more visual glitches or positioning issues.
In the Metall Daddy cutscene, the damage effect is now restored after players are hit by Ringman's Ring Boomerang.
Bass's Super Adaptor Wings is now rendered clientside to prevent visual bugs.

Bug fixes:
Fixed a bug where respawning on the first gauntlet would give you none of the weapons from currently defeated robot masters.
Fixed a bug where Quint would face away from his target while shooting.
Fixed a bug during the Gamma fight where the Met phase would be skipped entirely. This issue was caused by a clientside flag with the Hogale.
Fixed a bug where if a player fell in the pit during the Wily Golem battle, King, Duo, and Wily would freeze indefinitely.
Fixed a bug where Hornetman's bees would remain after a map change before beating Hornetman's stage.
Fixed a bug where Copy Robot would slide below the floor and get stuck during the first battle.
Fixed a bug where Metall Daddy would thrust itself at the start of the second phase if the Met Catcher's previous target was dead.
Fixed a bug where the Genesis Unit would constantly go into their formation phase, causing multiple clones of each member to spawn. This issue would most commonly happen if players spawned in weapons which weren't in the fight as the RollingCutterAmmo is used by the game to check when the next transition will start.
Fixed a bug where the camera would not work in the Robot Master Wardrobe and Training Room after returning from another map.
The leader notification system was changed to prevent a bug where the game would notify players of a new leader more than once when a player joined or left.
The freeze flag should now be reset after completing the Dozer boss fight.
The camera for the Doc Robot scene should now play correctly after changing maps.

Added a settings menu
Added administration options
Added player translucency
Fixed a health bar issue with Eclipse.
Changed the "In control" hud string in the Eclipse fight to "Current player"
CVARs are now autoloaded upon booting up the game into any map. Other CVARs like SV_MAXTEAMS will need to be set before actually starting the game.
The leader titlebar has now been moved to the left to reflect Coop-Mania (An option to change back to its original position is available in settings.)

The first version of Team Cooperative for MM8BDM v6b. This version is actually a revision which was made long after the original release.