Welcome Jack ?
Yep, as said by our Madhouse, you'll meet people there and most of them will be friendly ?
The first time alone can be a bit intimidating but remember its not a test its to have fun.
Just follow a couple of basic rules:
1) Shout 'HIT' and put your arm up when you feel a hit. (They'll keep shooting you until you do)
2) No magazine in the gun at the safezone. (Before going back take the mag out and fire a few shots to be sure its clear)
The forum has lots of info on masks and other gear so do plenty of reading and you'll be ready ?