There are a ton of exercises that can be done at home that are simple and easy and do not require any equipment. Push-ups, wall push-ups, modified push-ups (on your knees), crunches, curl ups, sit-ups, squats, etc.
As for the eating- Quick tips would be to avoid sweets, try not to add things to your food (salt, mayo, ketchup, etc), avoid fried food, eat balanced meals, etc.
Eat smaller meals throughout the day. Breakfast is the most important meal of the day- it jump starts your metabolism and gets it working. Eat within one hour of waking up and then about every 4 hours after that. Try not to eat within 5 hours before going to sleep and that should help a bit. As for the foods you should consume- it is completely up to you. I would avoid fast food completely, not drink soda, and "go organic". Anything that comes from the ground is fine by me. Lots of fruits and veggies. Avoid red meat. Chicken and fish are good. Eat brown carbohydrates (wheat bread, brown rice). Surf the Foodnetwork Channel for tips. Hope that helps some.