I got back into running recently, and am following this training guide, which basically starts you out mixing a little jogging with your walking, but steadily works its way up to running for one hour non-stop (after 13 weeks).
Slow and steady avoids injury, and all that. I need to combine it with plenty of stretching, though…
Also, in a depressing example of how fragile the web is, the link in that article to running form guidelines goes to a domain that no longer exists. :(
Here’s the Wayback Machine link: Benson’s EPS - Basic Movements in Running