Buy the complete set of the Foxfire books. Probably get them used if you search. Go to the library and request a few of them and see if they can help you before you spend. Also not a bad idea to know something about wild edibles in your area (beware of plants that are similar looking so you don't poison yourself) many plants have medicinal uses as well. It's interesting and helpful to understand the taxonomy system and meaning of the words used to describe the genus and species, for instance. Some Greek and Latin websites are helpful tools if you are on a budget. Etymology is important. Good luck.