I NEED A FITNESS PLAN TO LOSE WEIGHT!?

It you're just starting out, swimming will be lower impact than jogging, so I would recommend that. You are going to want to do cardio (not just in the gym--take the stairs or go to the restroom that is farther away, it's the addition of more movement throughout the day that will add up). In addition, weight lifting will help you build muscle, which in turn burns more calories throughout the day. Make sure you eat breakfast and are drinking enough water, both of which will aid your metabolism and help you gauge your hunger more accurately. good luck!