@swingersnotroundabouts
They are swingers clubs, not sex clubs. There is no guarantee of anything happening with anyone except your partner.
You and your partner are free to not use condoms if you decide to dtd in the club. The notice is there for others that you might want to join you and for you if you wanted to join in with others.
There is no "queuing system" for rooms. If you get the opportunity to play, then it's pot luck if a room is available or not.
Maybe don't go as soon as it opens - it'll be quiet to start with. Consider leaving it for an hour or so.
There are always new people in the clubs - you won't necessarily stand out, but it really depends what kind of night you go on, and what you might be looking for.
Nights where single guys are allowed can be tricky, as they can pay a lot of money to get in, and some may have a sense of entitlement. You may find that you get followed around, and if you decide to do anything in public, expect to be surrounded by hopeful single guys.
If you feel that you are being bothered, or the guys are creepy, remember that no means no. If that doesn't resolve the issue, tell them in no uncertain terms exactly where to go.
Couples only nights are easier, but finding a four way attraction isn't.
If you don't mix with anyone, you may not enjoy yourselves. You don't have to do anything with anyone, if you don't want to, but do use the opportunity to meet & chat like minded couples - you might find lifelong friends.
Yes, I'm a single guy, but don't let that put you off contacting me if you would like any other help or information.
Most of all, have fun!