Don't drink soda or other sugary drinks
Caffeinated beverages will raise your blood sugar and make you gain weight
Start slow, and do something you enjoy. Everything you do burns calories. What about playing DDR, swimming or riding a bike? Walking is sooooo boring for me, which is why I do it a couple times and stop. If you aren't interested you won't keep doing it. Gardening, hiking...lots of things.

Aside from cutting out soda eat what you want, just eat half as much as you normally would.

FYI, breads fill you up temporarily but there is so much air that you will feel hungry soon after. Vegetables, fruits and meat is what should be on your plate.