I'm training for a 5k end of March and a half beginning May. I started at 2 miles. Get a sheet, write your goals on paper and stick to it. Make them reasonable goals. I have a check mark on when I achieve 3 miles, 4 miles, etc. on my fridge to motivate me. What I do...
X-train Day 1, Interval Run Day 2, X-train Day 3, Run Day 4, X-train Day 5, Day 6 rest, Day 7 - run outside. Interval Run = run 10 min at one pace, then walk 5 minutes, run 10 minutes 2 paces higher, walk 5 min, run 10 minutes 2 paces higher than before, walk 5 min. X-train = weights, bike, elliptical,or just walking. If you don't make your goal or need to take an extra day off in-between, then do it and just pick up where you left off. Eat well and good luck! Don't worry about time, but stamina.