Best advice ever for noobs:
Go to a game, talk to people, politely ask to hold the gun. Personally, unless someone is being an arse (ie poking through my gear bag all willy nilly without asking permission) I'll not only let you hold it, but fire it. This is especially fun since I have a 203 with HP CO2 nades on one of my guns and not everyone has had the chance to try one out.
You can probably get AVed at a game also, but check in advance.