I just started at the gym. I've gone every other day so far. It's only been the first week, but I am starting out slow with about 30-60 minutes of cardio. Along with that I try to keep in check what I am eating. Eating breakfast is a big thing cause it gets your metabolism going in the morning. For lunch instead of a whole sandwich I eat half a sandwich and some fruit and a yogurt. For dinner I try to keep red meat to special occasions and eat more chicken and fish. I also try to make smarter choices like salad with dressing on the side instead of french fries. Thats about it.

Edit: I also don't drink soda, diet or regular.