One of the best recaps I've seen on food combining is by Choosing Raw blogger, Gena. She speaks about food combining regularly but did a very thorough post on it last summer. You can check out the post and Gena's blog here.
These are primarily the only Food combining rules I follow: Fruit First!! And watermelon always by itself eaten alone!!! Nuts, Nut butters last eaten unless blending. If Poor digestion, try eating mono meals. The community at 30bananasaday.com are experts on food combining. Peace.