1) Emerald
Don't know, but it's the most populous
However, personally I like playing VS Markov ;D
2) Costs 2-3 certification points each to be able to gain access to MAX suits. For 6 points, you get access to all three types. Theres a 5 minute timer per MAX suit type.
3) Yes, but how about instead I direct you to the totally kick ass Marcopolo's website and get you hooked up with a 7 day trial.
http://marcopolo.me.uk/PS_AD.html
Make sure to watch that movie
Also suggest you try reading this previous post
http://planetside-universe.com/forum...ad.php?t=28162