Oh hello!
I'm sorry, I won't be able to help anymore. It's been over a decade since I self-published my last book. The tools and process have changed slightly, and I don't remember much anyway.
The basic idea is that you're converting the text to a specially formatted HTML file (like webpages use) and then reviewing to make sure everything looks good. Back then I used a tool called Calibri to convert it from Word or PDF, and I think I used something else to polish it up. Then you upload it to Lulu or wherever else. (I was using Amazon KDP for ebook and CreateSpace for print. Lulu is also a fine option, and not Amazon as a bonus.)
There are professional formaters. The editorial association I belong to, the EFA, has a searchable directory of professionals and lists average rates. After breakfast I can pull up a link for you.