Congrats on taking your first step in getting into shape. Do you have any of the cathe workouts? I would suggest the basic step workouts and maybe you can do any of the weight programs/DVDs just start slow. Nothing happens over night it's a slow process but weight training is important to sustain your weight loss since muscle burns more calories in the resting state. Goodluck!
I would suggest you purchase all of the w/o's in this rotation: http://shop.cathe.com/beginner_exercise_workouts_s/88.htm. A full size cardio club step, a set of light dumbbell's, and a stability ball will start you off with minimal equipment.
If you have any more questions or concerns, please fire away! Everyone here is extremely helpful and knowledgeable .