I currently have two alternate history novels I'm selling on Amazon. The first one went on sale in April, the second last month. I'm editing a third one now. Sometime in early 2021 I hope to have another novel based on my experience as a JW published. I have been able to find a publisher through regular channels and Amazon has been a good alternative.
In response to your three points:
1) Good, you won't be disappointed. I've made about half my car payment every month with money from Amazon.
2) You can set up with a pen name
3) Obviously, it takes money to print books. Amazon takes a per book fee based on the size of the book. They send you the rest once a month, starting two months after your first sale.
It's been pretty good to me.
Make sure you sign up to make your book part of the Kindle Lending Library. It pays a little money (about a dollar for my 300 page books) each time somebody reads it from the library. I think I make most of my money that way.
Good luck to you!