Hi Zena! I absolutely second Twilight's book recommendations. Neanderthin is a great introduction. Then read Lights Out. Then, if you need more, and you're feeling ready for some critical thinking, read Paleo Diet.

A basic What-To-Eat to get you started is at http://www.healingcrow.com/dietsmain/paleo/paleo.html

And yeah, come back here and talk with us more!