No special tutorial on this one. When nobody joins you in multiplayer for about 10 seconds, the game starts with bots, but if you and your friend join under 10 seconds apart from each other, you should come in the same game. For some reason, I never have music and sounds in my games, well I will probably never update this game so just get some music on Spotify or Youtube, IDC.
If you want to know how I made this, just look at the code. Really easy project to make. I just did it because I was bored.