looking for advice on weight loss.

hello, im looking on advice to loose some weight. im male, 38 years old and 240lbs. i am looking to first loose weight specially around my stomach and around my penis area. i dont have much time to go to a gym so would be exercising at home. what can i do to get the best results, would it he going on a diet, taking weight loss pills or excersising or a combination of everything. also looking to see what excercises are best to do at home to loose the weight. only excersise i get now if it counts is i walk alot at work, and been doing 50 push ups everyday. thank you for any advice.