Much of the advice given so far would work great for you.
-Drink lots of water (in place of other things)
-Try to get at least 6-8 hours of sleep/night
-Give yourself at least 2 hours between the last bit of food that you consume and the time you decide to you pass out for the night
-Aim for at least 30-60 minutes of physical activity 3-4 times/week
-Stay away from foods that are high-fat (most everything fried, mayonnaise, desserts, etc.) and go instead with a balance of protein, carbohydrates, and good fat (i.e. monounsaturated)
-Eat five or six small meals rather than two or three large ones per day
-Build lean muscle mass so that you burn more calories even while resting
That's what I can think of at the moment, but there are a lot more suggestions out there. Just remember to give yourself some time with all of this; it's not a diet, it's a lifestyle change, and so you need a chance to adjust, and make these behaviors your habits. It took me over a year to work out the program that I'm now on, and even after four years of following and adjusting, I still cave every so often. Just be sure that your "stumblings" (as with everything else) are in moderation, and you'll be fine.