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A digital camera has been my best tool to learn with. The black & white ink drawings in the old books didn't help me a lot. So over the past few years I've taken multiple photos of various plants, researched them on line and at libraries as thoroughly as possible and when questions arose asked peers, friends, and a couple of university botany forums.
Ask around for someone who teaches. Try schools, 4H or FFA clubs, or the internet for that person. There may be clubs or courses in your area. Books are OK, but as others said, don't rely totally on them and get more than one for reference. Also, they tend to show the prettiest sample pictures.
Many plants have edible parts but are not completely edible so you should go slowly. Bring a notebook when walking and take notes or pictures.
Start in your back yard. Chances are there are 3 or 4 edibles right there. But again, confirm for sure before eating.