Running may burn lots of calories, but not everyone can run. Six a.m. may seem like a good idea until that alarm goes off. Start slow, and stay steady for the best overall results. DON'T stop - If you need to take a break, cut back. Try cutting down to 1-2 days and 30 minute sessions if necessary.
Good Habits are hard to develop but easy to break.
DO get advice from qualified instructors. Effective exercise programs can be simple, but be sure to keep your expectations reasonable. DON'T believe everything you hear or read. If it sounds to good to be true - it probably is. There's no miracle fitness cure.