How do i figure out what i should be eating? does my body need more of a particular vitamin? how and where do i get more than general nutrition info?

No easy answer but..: Great question without an easy answer as even nutrition experts don't always agree. No single diet is best for everyone- see http://tinyurl.com/nq4sx63 for the pros & cons of various diets and my recommendations at the bottom. As for checking vitamin levels, it is easy to test Vit D levels but others are trickier. Organic acid analysis can be useful; see a holistic/integrative doc or ND.