(change the path to where steam is on your computer)
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Then follow some guides to creating rooms and such and place a info_player_deathmatch entity somewhere then compile and play.
I just felt like making this thread because i saw a lot of new questions that were asking this and i took me forever to figure this thing out. Technically the VERC manual configure instructions are incorrect and under that config it will just load up the main menu and give you a invalid_map something or other error in the console. I hope this helps somebody who's starting out and frustrated, sticky if you want to .