Maybe you could start by translating the books you wish were available in spanish ? This way you could learn what you want about permaculture and other topics in english first, then take notes for your future book ? It's a great project and I hope you will succeed.
By the way, all my posts here are in french. If i am not mistaken, I think i am the only one who posts in french here. While I don't want to become famous or go viral, i hope that someone who speaks it like me will someday stumble upon my little bits of writing here. That is why I do this.
And also, this virtual pub is amazing.
Bartender ! Do you have some alcoholised coffee ?