Hey Sam, I am not so educated myself and started to get proper results only after spending a lot of time and research to understand some principles better than at hear say level. There is a lot of conflicting info out there so you need to be careful with that.
The best book I ever came across in the topic, and probably the most well researched book for the layman I know of is called Burn The Fat, Feed The Muscle, by a guy called Tom Venutto. He is a bodybuilder, but he explains you the principles, myth and reality to get lean mass and decrease fat (not weight). I myself had only mediocre results in both fronts until I stopped, re-learned a bunch of stuff and put the knowledge into action. Still ages to get where I want to though.
Tom Venutto goes into detail from the psychology of goal setting process to proper ratio of carbs/protein/fat, diets, right time to exercise, different body types and recommended diets, the right kinds of fat and where to get them, the correct number and components of each meal, etc, etc...lots of good references in this book as well.
One thing that will probably make a big difference is knowing where to find proper food. Beside good supermarkets, one place that I learned about and who the owners understand the principles of nutrition is RU? Cafe on 1521 XinZha Lu close to XiKang Lu. I was surprised to see they knew a lot about the less mainstream dietary components (such as flaxseed oil and how to put some omegas into your diet) and had dishes tailored to that. You might want to know them and talk more about this topic (they are run by a VERY passionate bunch of people, I can only see this passion taking them to success if they get known by enough people, let's hope for that...)
I know that two posters here are pretty much encyclopedias of nutrion and exercise (jenming and bluecheese) and run an extremely healthy lifestyle.
Any question I have I pass through jenming (because we work together doh!)

because the guy knows his stuff to a pretty deep degree

But then I am just a curious kid that talks too much
Anyway, hope useful and good luck.