You cant do a ton of sprint/agility/skill work AND a bunch of weight training in the same week and progress for long in anything.
Sprint/agility work is going to stress the same systems as heavy/explosive weight training. Your best to schedule your training to emphisis your strength work with less emphisis on the other qualities in the begining of the off season and then moving more toward sport specific drills and conditioning as the season approaches (while shifting to maintaining strength with the weights through the end of the season)
Spending a bunch of time on speed and agility in the early off season isnt going to do you much good. Start by building the strength, then learn to use it with speed and agility work and finally sport specific training (practice-fall training camp) to bring it all together
Im a big fan of elitefts.com for football specific training ideas (lots of stuff there about plyiometrics there too if you look arohnd enough)