Rather than adding new stuff, my guide focuses on making what is already in the game look better.
That's fine by me as I'd like the process to be as streamlined as it can be.
For leveling, Oblivion XP Update and Realistic Leveling seem like the two best options. I use OBXP myself, as I mention in the short gameplay modlist linked in the main guide. For landscapes, you've got Unique Landscapes and the HESU Mod Collection to choose from. Then for dungeons, you can use Better Dungeons and/or Snus Dungeons.
That's great thank you. It was more of a double check/opinion ask just to make sure. I'll be sure to check those out to see what I like best!