The Fifa Official sites
Fifa Association Official Site:
The Official Fifa International Website can be found here, it contains great information about Football all around the world.
EA Fifa Official Site:
The EA Sports Fifa website can be found here: http://www.ea.com/soccer/ They have a great blog that can help you keep up to date with some important Fifa changes. It also has great info on Ea Ultimate Team and Ea Gameface
Be sure to check them out, they both offer loads of info that can improve your game. Forums are especially useful to solve your unanswered questions, make sure you give them a fair go.