I am gearing up for a sprint triathlon in May, so most of my spare time is spent either running or cycling or (ugh) swimming. This becomes slightly more complicated when you consider that I only eat fresh fruits, vegetables, dairy, and meat--i.e., no processed carbohydrates of any kind, including complex sources like whole wheat pasta and brown rice. You wouldn't believe how much grapefruit and spinach and Greek yogurt and turkey it takes to make up the ~6000 calories a day I need to maintain my weight at 195lbs (I am 6'3", by the way).
To the OP: You absolutely have to define your goal(s) clearly, whether it is losing ten pounds to completing an Ironman, and then briefly mapping out a (reasonable) timeframe for accomplishing it. Keeping track of progress is also essential; otherwise, you cannot be sure what is working and what isn't.
Diet is the single biggest determinant of whether you achieve your goal or not. Most of your energy will come from what you eat, regardless of how much body mass you end up losing through exercise. Some of the suggestions upthread might be useful in learning which kinds of foods offer benefits beyond caloric supplement but you can always do your own "research" online. I happen to eat a lot of nuts (almonds, Brazil, macadamia, pecan), blueberries (frozen, in smoothies), fish (tuna, salmon), and celery. Some things will work for you and other won't (cottage cheese is a great diet food but I have decided I don't like it. Oh well). I also take a men's multivitamin, fish oil and flaxseed oil (both omega-3s and other stuff, perhaps a little overkill) but supplements are meant to do just that, namely, supplement your (excellent) diet.
I do not know how much of my exercise regimen will be useful to you but I do interval training either once or twice a week with the aid of a heart rate monitor (which, by the way, may be the best investment I have ever made). There is a lot of information about IT and HRMs online, but again, it may not fit into your goals. If you want to know more, let me know.
Mostly though, exercise has to go from something you merely do to becoming a part of who you are. And as with fragrance, it is most satisfying when you do it for yourself and not for anything or anyone else.