Keith is right of course. Even the most efficient program in the world can't work if you aren't motivated to actually DO it. So start with things that are fun for you. Like the outdoors? Then get walking! Prefer video games? Get a wii and at least get off the couch.
Looks like you just need some help with the basics at this point. One of my favorite websites covers all of the diet and exercise basics from a Christian perspective. It is easy reading, but really could be just what you are looking for. This is a link to an overview article about
Christian health, but be sure to follow the links to the more detailed articles. Best of luck!
Lem