Going to answer all in one here, I hope.
I never did get Calibre to work on the Nook and now I know why. I figured it was me just being dumb. I did get it down loaded though. BUT some how by D/L Calibre I was able to listen to an audio book I had d/l to the nook and book mark it where before I could not. So I was happy and left well enough alone. Before I was listening to the audio books with a music player and had to write down the numbers to go back to each time I has to stop the book and come back. It was not a satisfactory way to listen to the audio books.
I down loaded Calibre to my laptop and figured how to get one book to it and I was able to read the book in the Calibre viewer. I only checked a page or two and it worked so that is good. As I understand I can send the books to my device of choice and use that as my reader. Mostly use my laptop version as the catalog to find books on. Like the mother ship of my books. LOL
The win 10 tablet is an RCA Cambio. Win 10. As I understand it is it a tablet running windows not apps. This is an amazon listing for the info on it. I bought mine through ebay for $90.00. I planned to give it to my Mom but decided to keep it because I love the ports on it. Camera is icky but I have a camera.
https://www.amazon.com/RCA-Windows-D...RAM+%2B+OFFICE
There is an office program on the RCA but it is only a trial so I will just do the Open office or Libre Office as you suggested. I just need a spread sheet to work with. I am no longer doing the city books or anything fancy like I used to do. HA I used to be smart.
My biggest question and I have been looking for the answer is. Will I need to load each book from Amazon one book at a time to my computer then to Calibre? Am I missing a way to batch load. I have not found the answer to that. I am headed to bed. My brain just turned to mud.
Thank you all so much.