I agree with the above poster. You can join a gym right now and they would help you get into shape! As for nutrition, I would stay away from sweets such as soda and chocolate. Those are pretty much empty calories. If you are going to be working out or if you do join a gym, proteins will help.
Just make sure that you aren't eating more than you are working out. (Pretty much don't eat so much that you can't burn enough of it off when exercising)
The best way to burn fat is to do cardio vascular exercises such as running and swimming. Those two are extremely helpful when trying to burn fat.
I hope this helps and I hope more people pitch in some advice. Have fun and good luck!