How to make a MOBS style lobby?

like in DOTA or stuff like that.

 

For those of us not intimately familiar with DOTA or "stuff like that", please elaborate

 

Where, it waits for all 10 or how ever many people that play in a match. To connect then starts the game, like CSGO.

 

So, you want a lobby system where players join a room, and once a specified number is reached, the players are connected to a game server and their game starts?
Please stop using other games as examples. Don't assume people are familiar with them.

 

Sorry, I just thought these are some big games and people would know

Yes that's exactly what I want. But I also want the player to be able to see the other players character selection and username