Questions/devices/cloud

I have spent many hours and months on this and still have a difficult time as a non-talented, non-technical newbie. I am hoping someone can figure out if this is possible to do.

I loaded books to Calibre about 15k maybe... or about 80 gigs worth of books, not all mine I share mum; however, I am the only one that has a computer or works with a computer. I have gotten my 80 something bedridden mum to read books on a tablet so I have been trying to find all her printed books in a mobile format. She loves reading this way as she can make the print HUGE.

I have and share also:

Kindle Fire 6
Kindle Fire 7 (2015)
Paperwhite about 3 years old
Kindle Voyager
3 Android devices


What I am trying to do is to put in a cloud so that any of those devices can download books. I am not sure how to do this as well.

What I want to do is to make sure on all the devices it shows as:

{series}{series_index:0>2s| [|] }{title}
Example: Codex Alera [02] Academ's Fury

and of course sorted by author as well

Is this possible?

If it is possible what are some ways it can be achieved?

Also, keep in mind that I have spent a while reading the manual etc and learning from trial and error and do not have any special talents like the people on these boards do. Simple terms:help::o

I do "send to kindle" from my pc but it doesn't show the series and number on the kindle and or android as well. I have all my books on pc unless there are books that came directly from amazon.

Thank you so much for any information that you can give me.


Other questions:
I have Kindle unlimited and I see that there are books with audio format built right in. Is there a way to copy the whole thing? So many questions.

How about text to reading?