There's not much sense in worrying. You seem to be really wanting this to work out, so it will with your commitment. Worrying leads you nowhere, see what happens and go from there with a positive attitude. I'm sure everyone that does join wants to make this work close to as much as you do and that's what really matters. Quality over quantity. And if some people are bad, easily to get rid of them.
Leave your worries be and feel confident you can handle anything, by yourself or with your friends, etc. Shouldn't be any reason left to have nightmares. Be strong and stay strong. This goes for any situation.
Hope this helps somewhat.