Training
Everyone is different, and everyone has different reasons for running. No matter what those are you should find something suitable here
Beginner: Couch to 5k
As it says - the aim here is to get you from nothing, to be able to run a 5k without stopping.
Beginner: How to Start Running
Another take on starting from scratch by Global Triathlon Network
Beginner's Guide to Trail Running
Ready to get off the road and head for the hills? This will help you prepare.