I need a workout routine for a teen male.?

Hi.

I'm 15, 5'8, and 173 lbs.

I'm a bit overweight since all I do is drink soda and sit on my Xbox; however, recently I have gone "cold turkey" on soda and started drinking water and its working so far. Anyways, I love my Xbox and will not give it up but I do want to spend a little less time playing games and spend more time trying to lose weight and build some muscle while I'm at it. I'm really out of shape:

I can't do a situp, pull up, or run a mile nonstop (I use to be able to) and I can do maybe 12-20 pushups straight.

I'm looking for a workout routine that I can do in my room and without any equipment (maybe some weights can be used).

Thanks for your time and help :)