Congrats on the decision to get in shape and drop lbs. Don't kid yourself, healthy and sustained weight-loss will take: Time, Discipline, Hard work and to back off on the eating.

1) Try to not run more than a 250-350 cal deficit per day, going beyond this will make you weak, increase risk to get sick and you'll be hungry.
2) Start riding more, aim for 2-3x per week and at least 15-20 miles per time. Try to mix it up with jogging or long walks 1-2 x per week (aim for 1hr each).
3) For food: drop any sugared drinks (make water the only fluid you drink), drop all fried foods (no more fries or deep fried chicken) and be honest with your calorie counts. Up your fruit and nut intake and drop the sweets. As for your 20 mile rides, water is all you need (energy bars etc. only really needed for >50+ mile rides)

If you follow above, you will see a profound effect after 2-4 months. Good luck!