Hey wannabe! Welcome to the Zone. Everyone is different and the Zone addresses how to find your prescription. If you go to the tools section of the www.drsears.com website, you'll find a fat calculator. That will give you your blocks for each day. It depends on your weight, size, gender, activity level, etc. Then you start out with a 30-30-40 balance, and see how each meal makes you feel. Then you adjust the ratio depending on how you feel after 3-4 hours.... I can never remember what the test is, but it's in all the books, I think. I know it's in a week in the Zone (mine is loaned out right now or I'd go look :) )
Even if you start with the protein the size and thickness of the palm of your hand, and fill the rest of the plate with vegetables and a piece of fruit for dessert, you'll be well on your way. (Use a dessert sized plate for snacks).
You can get the Reader's Digest version of the Zone from the getting started link on the www.drsears page...