pull ups, body squats, and push ups are great. don't underestimate them. all are compound movements, meaning they engage a lot of different muscle groups.
http://www.livestrong.com/article/406939-at-home-exercises-with-no-equipment-for-women/
http://www.livestrong.com/article/379524-the-best-workout-for-obese-people/
Be sure to get the OK from your doctor before doing any exercise program!