Coming Down-Hill with A Plan

I did hill training for 4 miles in 37 minutes last night. I am now tweaking my routing a little to incorporate some of Jack Daniels' methods from his book Daniels' Running Formula. Specifically, I want to clearly define the percentage of time I spend running fartleks, intervals, hills, sprinting, etc. I have used training plans in the past. Now I want to tailor my plan specifically to my goals. I am comfortable running 5k and 10k races. I may seek to run half marathons by the end of 2009. If I do take this approach, a new training plan will be imperative.