Doxy,
Newegg and TigerDirect are very similar.. Newegg usually doesn't deal with insane rebates and Ive head a good track record with both.
You can join any game, if you get a 'bad password' error, just try a different server. As for as protocol, you'll pick it up quick. I'm not sure if we have an FAQ.
But here's some vocab:
Liner - someone who sprays (shoots) one spot. Strategical, but frowned upon.
Camper - somoene who stays in one spot and snipes people. Also stragetical and therefore frowned upon
Recon - After players die they can hit 'P' to watch players and cycle through them with '[' and ']'.. recon is when a dead player on the team gives locations of enemies by watching them. They use team chat which is the 'y' key.
if someone says 'no kills' it means they have the flag and would rather capture it and get 5 points then win by elimination and get 1 point.
A few tips..
-In siege castle if you're in the castle then don't leave the castle...
-Ignore people. A lot of players in game will flame you with racism and other ignorance, especially if you're new, just ignore them completely and let others see how childish they are.
-Download a map pack (I can give links if you don't have one already)
-Download a hi-res pack (I can link you to this too)
As for as protocol goes... I mean, just shoot and kill the other team
Cheers and good luck, post if you ever need anything,
y00tz