Footwork Drills for College Football: Enhance Agility & Speed

Question
My name is LeVerne Harris. I am a 5"10, 215 athlete. I plan to walk on and play either half-back or strong safety in college (Bethune Cookman University). I understand that foot work is very key when playing this two positions. I am very sure that once i lock down this area i can compete on the colleague level. My goal is to make it to the NFL but i just need some help on some areas.
Are there any drill to create a consistent 40 time?
Are there any drills i can use to enhance my footwork?

Answer
Dear LeVerne,
I just found your question in the question pool and I think I can answer it. Take a look at this web link. http://en.allexperts.com/q/Football-Instruction-2069/Lineback.htm

It is from our history football library.

Your friend, Louis