Not a novel but a craft book.
I went to a local printer who was very helpful with advise about margins, paper weight, cover pages etc. those sort of technical issues.
The thing that came next, after the book was printed, was the promotion and marketing. I was lucky in having contacts at craft magazines I had written for. They wrote positive reviews for my book with contact details of how to buy a copy.
Have you written any short stories for magazines that could help you in this way?
I also put my book on Amazon, which made it easy for people to just click on there after reading a positive review, and buy a copy. I would then get an email from Amazon and I would send out the book.
The other thing I did was offer myself as a speaker at local groups for my particular craft. I would talk about past work and how I came to write the book and take copies with me to sell.
Do you know of any writing groups where you could do the same?
Could you offer to do a talk at local libraries?
I hope I have been of some small help with my experience.