Yo te enseño español y tu me enseñas persa =)
I think this website is useful: http://persian-language.com/learning-list.html
Also, in below URL you can download Farsi educating books in any level:
I hope that they will be ok.
There's not a book that particularly focused on alphabet.
But I found this site interesting
I'm studying persian in Madrid. I was travelling in Theran, Isfahan and Shiraz in November.Also Persepolis of course. It was my second trip and this year I repeat. Could you recommend a basic book for learning the persian alphabet???
ＹＯＵＲ ＭＯＶＩＥＳ ＩＳ ＵＳＥ persian