Ok there's a few issues there. Let's see what I can help with:
Re reading the group emails and instructions - do you mean you can read the emails fine, you just can't follow the instructions? (If so, please let us know which specific ones if the rest of this doesn't help).
Firefox has a built-in PDF viewer, but it isn't as accessible as Adobe Reader. In Firefox press ALT+T then O to go to the options. TAB down to "Search file types or applications", type PDF and press ENTER. Then press TAB once to the list of file types and PDF. Tab again to "Preview in Firefox" and down arrow to "Use Adobe Reader DC". PDF files you open from web pages should now open in Adobe reader.
You should be able to read PDF files in Adobe reader by either using NVDA's reading commands (eg say all with NVDA+down arrow or NVDA+A) or arrows etc. If the file won't read at all, it's likely it is made as an image of text. In that case you can try using NVDA's OCR function to read it - press NVDA+R to recognise, then use the reading commands. If it is an image of text, however, it is worth writing to the original author to advise them that it is not accessible, as OCR does have its limiations.
I haven't tried Atlantis lately, so I can't comment on how well it works. If it isn't accessible (and I'll leave it to others to offer more wisdom on that), then you might consider Jarte as a word processor which is not Word, or Libre Office.