Pops gave you a good resources. Here is another resources that will really help you understand the needs of kids of that age:
ABC's - agility, balance, coordonation, speed. Play games. Do competitions for fun. Things like tags, obstacles courses, etc. are fantastic.
If you "drill" too much like football was doing - it is not appropriate for that age. You have to develpo their ABC's through fun and engaging games that will challenge those qualities. Make drills and exercises some form of game.
At that age, they don't understand or certainly don't value "work" or "working on something" - they just want to have fun.
Here is the link to the document (look for the section about the age of the kids you will have in FUNdamentals) and read about the characteristics and needs of kids:
FUNdamentals
Check the downloadable document in the resource section. This stuff is written for the average joe but is brand new and is based on cutting edge research on the long-term development of athletes
(I am familiar with all that stuff because I did most of my Master's Degree on the topic of Long-Term Development of Elite Softball Players).