I’m working on the Couch to 5k plan:

[A] fantastic program that’s been designed to get just about anyone from the couch to running 5 kilometers or 30 minutes in just 9 weeks.

Take a look at the link, you’ll get it all sorted. Basically, it’s three sessions a week for nine weeks, or 27 sessions. I have the Android app to help me along, and it’s powered me through two sessions. Only 25 more to go.