Hola Angie!
Yo estoy bien, gracias. �Y t�, c�mo est�s?
Yes, that's correct, it is "voy a comprar", for "I am going to..."
When you said "Voy a comprar el libro primero Miercoles", I think you meant "I'm going to voy the book NEXT Wednesday"?
If so, you should say "Voy a comprar el libro el pr�ximo mi�rcoles". (Note also that in Spanish, days of the week, months, etc., don't use capital letters).
Ok, now, here is my answer in English / Spanish:
Anyway, in case you want to buy it at Amazon, this is the link:
(De todos modos, en caso de que quieras comprarlo en Amazon, este es el enlace:)
First Spanish Reader: A Beginners Dual-Language Book (Beginners' Guides) by Angel Flores
Hope to hear soon from you!
Espero tener noticias tuyas pronto!