There’s a lot that goes into publishing an e-book. First, you need to have it professionally edited. Make sure the story you want to sell is the absolutely most-polished version you have. You want great reviews that translate into more sales!
Then, of course, you need a front cover, a correctly formatted manuscript for each of the e-book sellers, an ISBN number, and someone to put it up on Amazon and other bookseller sites for you (or you can do that yourself with the final book).
I’ll be putting pricing up soon for the formatting part of the process.