chints, I like walley's advice a lot! What I would recommend in addition is that you keep a food log. It's a hassle in the beginning, but if you want to get a handle on manipulating and controlling your body composition (the amount of fat and the amount of LBM), you're just going to have to break down and do it. Check out Chris Shuggart's article, "The Missing Ingredient," @ www.t-mag.com/nation_articles/162miss.html.
The way I would approach dieting is to do just as walleye said. Calculate your protein and fat requirements. Start out with 100g of carbs per day. The first two weeks don't count. But after that, if you're losing weight too fast, raise carbs slightly. You'd also want to raise carbs if you see that you don't have the energy you need to work out and lift weight.
It's a dance, chints. P & F don't vary much. Carbs are raised or lowered to suit our purposes, help us meet our goals and to manage energy levels. I also like the idea of taking in the majority of your carbs PWO and eating mostly P+F meals leading up to your workout.
For structure and hard numbers, why don't you look at T-Dawg 2.0?
Any other questions, don't hesitate to ask.