Diet is obviously a large component, stick to what advice has already been given. I'd listen pretty damn closely to Vivi on that one.

As for actual exercise, I would say to minimize your steady cardio unless it's swimming and throw in some HIIT. For weight lifting the best thing to do would be as many heavy, compound lifts as you can manage. If you have access to the equipment of course. Starting Strength would be a good place to start since it's a few lifts to get you used to the forms and build up a good base level of muscle. And if you follow the advice for finding your starting weight, you shouldn't really need too much help from a spotter for a couple of weeks if you watch videos on how to do the lifts properly.