In the UBI forums, look for posts by a guy named Bearcat99. In his sig, there's a link to the "nugget's guide". That is the absolute best compilation of info for new people as well as old.
edit: Actually, it's in his sig here as well:
http://forums.ubi.com/eve/forums/a/t...3/m/9121094645
Another fantastic source of information including 3rd-party campaigns, skins and utilities, etc, is Mission4Today:
http://www.mission4today.com/