I've never really put together a team in Football Champions.  Honestly, I have no idea where I'd start.  Actually, scratch that, I would get a solid core up the middle.  Give me me a top drawer centre back, midfielder, and a killer forward.  
I figure this would be the place to go over any ideas/team formations I'd have when building a team.  All the potential strategies and players to pick from will give more interaction between myself and....uhhh yeah, myself.
However, someone I know from prior sport card games (sup MLB Showdown) wrote a great piece on his website.  It's worth the read, I promise.