I have recently started to enjoy watching football. I understand the
basic rules (downs, scoring & penalties) but I?m seeking a deeper
understanding of the game.

The following are concepts I would like informative web pages on? 
1.	Formations (eg. Nickel, dime, etc) and their uses.
2.	Over all game strategy.
3.	What makes a good coach?
4.	General information on what each player?s responsibilities are. 

I?m also open to any suggestions of information that would be helpful
for me understanding the game.

Thanks!

You might enjoy Madden or ESPN football for xbox.

imho, a good coach will attempt to create mis-matches, such as a slow
linebacker covering a fast wide receiver in pass protection.  He will
also recognize the other coach's attempts to do the same and make
adjustments quickly.