Half marathon is my distance but good for you! I know a few people who have successfully done the Couch to 5K program. If you haven't already I do encourage you to line up several 5K races. For most people, running (or waddling, or whatever is your speed) is like learning a foreign language. If you don't have anything encouraging to you to keep using it, it fades away.
The
Runner's World Race Finder is a good tool for finding events in your area.