5k Training Schedule 10k Training Schedule
Don't wait to take walk breaks. By alternating walking and running from the beginning, you speed recovery without losing any of the endurance effect of the long one. Start with jogging one to two minutes and walking two to three minutes.
As your training level increases you can adjust your run/walk ratio to running 5 minutes/walking one minute on your long runs.
Be sure to do the running portion slow enough at the beginning of every run (especially the long run) so that you'll feel tired but strong at the end. The conservatism will allow you to recover faster.
Every other day you can cross-train instead of walking. Cross country ski machines, water running, cycling, and any other other mode which you find fun and interesting (but non-pounding) will improve overall fitness.
Stay conversational on all of your exercise sessions. This means that you should be exerting yourself at a low enough level that you could talk. It's okay to take deep breaths between sentences, but you don't want to "huff and puff" between every word.
As the runs get longer, be sure to keep your blood sugar boosted by eating an energy bar (or equivalent) about an hour before exercise. Drink water continuously before and during exercise and with all food.