Hi,
My name is Gilbert. I really want to help with your project since your desiring to help people. Actually I learned this idea first since I also want to sell ebook of my own. I have been also testing this kind of automated delivery of ebooks, and it really works. I know that you want customers to be directed to a site where they can download the file after they purchased thru paypal.
In fact I also have paypal account. with my account, I usaully test all buttons I am created with my paypal account.
I you want to try my skill, I would be very glad to work with you.
With this kind of project you also need to buy webhosting for your ebook to be in stored, where your customer can download the file. If you want a sample and if you don't mind just give me your email address and I will send you message with paypal button. You can try it I will just put the amount of $1.00.
Just click the button and pay. Then return to vendor, which this will lead you to a website where you can download the file.
I hope I could hear from you.
Cheers,
Gilbert