Start by adding more fibrous greens to your daily nutrition. Things like cauliflower, spinach, salads, broccoli, asparagus... These are filling and very low calorie. Eat some kind of protein with each meal. i.e. some kind of meat like chicken, fish, or lean beef.
Exercise: Some
resistance training 3x a week. Full body workouts are better IMO. i.e. lift weighs. Do some cardiovascualr exercise 5x a week, start easy with walking every day for 20 minutes, then 30, then 45...
Do these things, keep an online
workout journal here at DF to get input from others on how you are doing. This will get you off to a good start then we can adjust from there as needed.