E-books

More and more I am intrigued by e-book publishing. A friend is urging me to get with it and get NICE GIRLS DON'T BITE launched as an e-book. Well, I'm studying how to do it. Although Amazon's instructions are step-by-step clear, they are still sometimes daunting to a user. Hypothetical example: "Next, save your text in FLUB.dub format." And I'm sunk. What's a FLUB.dub format and how do I do it? I'm afraid of getting halfway through a launch, screwing up, and having a half-book out for people to laugh at.