college runner is offering you some good stuff here. Kudos to you for having the desire & maturity to motivate yourself to train like a champion.
Couple of points:
-Like CR said, do not get hung up on the mileage. If you get to 100, great, but if the wheels start to get wobbly, be smart & back off. Running through pain is stupid. Heed pain, listen to your body.
-I like the idea of strengthening exercises. Coach Jay Johnson has an excellent video series you may wanna check out:
http://runningtimes.com/Article.aspx?ArticleID=23764&PageNum=1
This stuff is much better than getting in the weight room & benching & curling, IMHO
- take care of your body. Rest, hydrate, ice bath, massage, etc. Be hyper sensitive to signs of imminent injury warnings..
- take a real interest in biomechanics & form, if you don't already. Have a gait analysis done - some running shoe stores & others do for free. Consider a tranisitional minimalist shoe.
- you mentioned trail running. I like that idea, provided you're not doing a lot of technical root/rock climbing every time out
- if in doubt or if(when) you get that dead legs feeling, take it easy for a day or 2. You can still maybe run the distance, but force yourself to relax the pace. WEhen the Kenyans run easy, they run really easy..
- your plan has plenty of tempo/threshold stuff - maybe even too much. Run how you feel; don't force it. Your pace will gradually drop as you get stronger. Be patient - you have lots of time.
- strides on grass are great for an easy day every week. Find a nice grassy field & do them barefoot. Don't run as an all out sprint, just fast, light & relaxed - but not max effort.