Here's how I started, it might work for you:
Give yourself one point per day if:
1. Accountability: record your food somewhere...food journal, on one of the boards, where ever it will hold you accountable to write it down. It doesn't have to be super detailed. Just a place where you are going to have to fess up to the slab o' cake or something like that AND start to figure out what does and doesn't satisfy you. If 5 days in a row of Lean Cuisine starts to create a trip to the vending machine at 2:30pm, you'll be able to see that and make a tweak.
2. Exercise: Any exercise...walk around the block, march in place during commercials, anything. You are trying to establish the thought process that you need to get it in at some point. Again, don't worry about how much, etc., just do something.
3. Water: Increase your water consumption. If you aren't drinking any, add a glass before each meal. If you are drinking it already, cool, easy point.
4. Me time: Take 15 min to do something just for you. Read, journal, whatever is a 'treat' for you.
5. Good/Better/Best Choice: Make one good/better/best choice per day. Skip a treat, count out the chips instead of eating from the bag, leave a bite or 2 behind. Only need one per day.
You can set a reward for days in a row with 5 points or I use a weekly total of 30+ points a week for a reward threshold. Find a meaningful non-food reward and give it to yourself when you get the job done. You'll likely get to a point where one or more of these is too easy and then you can start raising the bar for yourself gradually. Make the exercise goal a certain number of minutes...got the water? Change it out to fruit/veggie servings.
You can do this. You will have to figure out what does and doesn't work for you and what you are and aren't willing to do. It's going to take more than a week and less than 10 years.
But you can definitely do it!