How to but a sell key in blog?

how to sell a product in my blog? its hard to ask the question but i want to sell an Ebook in my blog and i want to charge for it however i have no idea how to do that basically what i want to do is just like this site http://www.becomerichindian.com/ they have the option to be able to sell a book online... show more how to sell a product in my blog?
its hard to ask the question but i want to sell an Ebook in my blog and i want to charge for it
however i have no idea how to do that

basically what i want to do is just like this site

http://www.becomerichindian.com/

they have the option to be able to sell a book online and people get to download it when they buy it the only Difference between me and them is that am not a scammer:(

i have seen similer thing in a Wordpress , so i was wondring if i can do the same for my blog
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