Again Joshua with the nail on the head. Sepp's three books are a great start, I would even suggest reading them in reverse order, from most recent to the first one. I wouldn't worry about German - English plant names, we will have translators that know all of this. Also there are different plants here in the America than in Eurpope, it is the concepts and approach that is most important to gain. Reading "
Desert or Paradise", then "
Sepp Holzer's Permaculture", then "Agro-Rebel" would be my suggestion.
"Botany in a Day" is a great book for plant identification. It teaches the families approach of plant identification. With this approach you can more easily understand the uses and ecological role of a plant without having to know the specific species.
Zach and Team Holzer AgroEcology