I'd focus on ensuring you have the basics of writing
first: read
Wonderbook by Jeff Vandermeer and
Save the Cat by Blake Synder. Then put the opening pages up in Critiques. Understanding the tools covered in both of the above will help you separate personal likes from objective criticisms in any feedback you get.
As for self-publishing itself - it's easy and simple when you go through Amazon - no need to worry about typesetting and don't waste your money on ISBN's as Amazon provide these for you. The Kindle publishing process is simple and easy: you upload a doc or text file of your MS - check the preview to make sure it all looks okay - then you upload an image of the cover, then select a few options - save, done, published your ebook. Then you do the same for the paperback option below your newly published title, which is print on demand and has an option for expanded distribution which means any book seller can order a copy for their store if someone asks them to (though you need to charge more to cover any book seller cut). Done.
Also, as in another thread, don't rush to self-publish a single book. You need multiple titles for self-publishing to work really well for you, especially if you have a discounted first book with follow on titles. If you don't have those follow-up books ready yet, hold off publishing that first book until you do. I cannot emphasize enough how difficult it is to promote a single novel over a series.