For a savable in game text editor check out
Papyrus or perhaps
Endeavour's NotePad.
Papyrus' author states that you can run pages as scripts so perhaps you could use this to output the page to your players. I've never used a mod like this so read the pages and see if either works for you.
For very customizable nameplates nameplate check out
Aloft. The default nameplates include a threat glow indicator while Aloft has a ton of newly added threat options.
For the poster on the previous page: You could consider using Aloft to display mob health on your nameplates.