All you would really need to do is to find a triathlon plan with about the same distances and get rid of the bike and that would work fine.
What is your distance? We can probably help a little more.
You can check out the triathlon plans here, find your distance and just modify by taking out the bike workouts.
http://www.beginnertriathlete.com/discussion/training/trainingplans-list.asp?h=1
Good luck!