Learning about the series isn't too hard. For the most part most of the Gundam series follow a similar plot skeleton. So if you understand the basic plotline for Mobile Suit Gundam and Gundam SEED, then Gundam Wing isn't too bad. My only problem was following the storyline if I missed an episode. That could be me though.
No worries, about lack of knowledge. Here are some links to get a better picture of Gundam Wing.http://en.wikipedia.org/wiki/Gundam_Winghttp://www.mahq.net/animation/gundam/gundam.htmhttp://www.mahq.net/mecha/gundam/index.htm
I would point you to gundamofficial.com, but I do not think the update for Gundam Wing is done(and I doubt it will ever get done.)
The main list of mobile suits that will be available since the characters are going to be part of OZ will be listed below.
These are all of the models of mobile suits that human pilots use the most. The rest are either one of the kind mobile suits(i.e. Tallgeese and all of its incarnations) or ran by the Mobile Doll(Computer Operated) system(i.e. OZ-02MD Virgo).
Seeing that everyone is fresh out of the academy everyone will be either stuck with a Leo or an Aries at first as they are the basic models for OZ.