Go shoot! Be safe and have fun. Remember, everyone was a beginner at some point. There will be folks there that are very good and some that arent so good.
CDP is a misleading name, but it sound better than the 8 shot 45 ACP division. You will see everything from custom 1911's to stock Glock 21's. And just because a fella shows up with a $3000 custom pistol doesnt mean he can shoot it worth a damn. Take that Sig and have fun.