Hey Zach! Welcome to the P90x crazy family

Congrats for taking on just a great program.
Did you happen to get the nutrition guide book that came with the P90x DVD's?
YOu should start by finding out what your caloric needs per day is with that formula in the book. Then you can reduce that total number by a little bit for weight loss (like around 500 calories per day or so).
You can use the "portion plan" approach for your correct level of eating. This way you don't have to be a fancy chef or buy expensive kinds of food.
Once you figure out your "level", it will tell you to eat something like
7 proteins
4 carbs
2 fats
1 condiment
etc.
They give you a list in each of those above categories of what food is that category...like protein would be fish, chicken, etc.
Then you pick the foods under each category that you can afford to hit those totals.
With P90x you can't "diet" like those other kinds of programs out there. IT will actually backfire. If you don't eat enough food, your body will go into starvation mode, and your metabolism will slooooooow way done, then you body might start to eat all that nice muscle definition that you are trying so hard to build

It's just my unbelievable urge to wanting to pig out on a big cheeseburger from any nearby restaurant that just hurts me on the inside!
The reason you feel like this is your body is starving. With this program you actually eat more food than you've ever eaten before, but the "RIGHT KINDS" of food. Food that helps your body change. Once you start eating correctly you won't crave those kinds of things.
Take a moment to re-read that nutrition guide, and feel free to ask questions here on this board.
Take care
Karen