Victoria: Honestly, diet is 80% of weight loss. I've worked with trainers, etc. and they can only help you so much, if you want to lose, you have to eat better. Do you have a plan in place for diet?
Working out is another, start with walking, building up your endurance. I know Burgundy has done the Couch to 5K program. Lift weights, you can do that by getting light handheld weights and doing different workouts with them.
My journey (lost 85 lbs in the past, then got pregnant with twins), started by eating better. As I saw that weight coming off, I was more motivated to get moving. Did the gym membership, worked with a trainer, now I workout at a boot camp, which is wonderful because you get encouragement from everyone around you as well as the trainers.
Hope that helps! Feel free to ask any questions, more than happy to help!