Ah weird I just saw this. I'm currently training for a half marathon that's coming up in the future.
I started with a C25K program that was awesome, I would recommend using these podcasts. She has good music, and has it all split into weeks so all you have to do is listen and run when she says to.
http://chubbyjones.libsyn.com/category/podcasts
Currently, I'm doing 35 minutes running (about 4 miles) a couple times a week and feel great. Definitely get in your Protein and stretch! I can't believe I'm going to run 13 miles, crazy!