So I used Publisher Rocket (this is my affiliate link), it is what I have used for my last two books and both have become #1 Bestsellers. I’m sure there are some free options out there, but this one has a really great user interface and the videos to help you learn how to use it are super straightforward.

I’ve tried to do it on my own or use a couple of free websites, but the books I did that with didn’t do as well.