How much does it cost to publish my book with Kindle?

Yes.

No, it does not cause spine damage to the book.

There are a lot of great self publishing companies out there. Do your research online to compare the costs, types of publishing packages, and the different types of price points.

You have to go to the Reports section, which is beside the Bookshelf button.

KDP accepts most major digital file formats, including DOC, PDF, HTML and MOBI.

No, but there is to being eligible to get a tax number. That age depends on your country, and sometimes you need attain a certificate for business management, too. Maybe...

If your book is good enough to be published, then yes, although they will need to work closely with your parent(s) or guardian throughout the process.

The cost of self-publishing can vary greatly depending on presentation, length, editing, formatting, and promotion, among other factors. Generally speaking, however, it is certainly possible to self-publish for under $1,000.

The primary job of a literary agent is to find an editor who wants to buy your book (and to negotiate the best deal for you). A good literary agent...

You can either self-publish or send your work to a publisher. If you send it to a publisher, you may be rejected.