Question 1
I am not sure if I am doing the load order right and needed help?

https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2216670956

I am following that load order that the mod has listed underneath Compatibility and Patches and I have those mods as well.

How do I tell if I have done it correctly?

The mod I am currently wanting to expand with other mods is More Bookmarks+

The order I have it in is
1. Regional Immersion and Cultural Enrichment (RICE)
2. Community Flavor Pack
3. Ethnicities & Portraits Expanded
4. Unit Packs Expanded
5. CFP+EPE Compatibility Patch
6. The Catholic Trinity: 1.15.0 "Crown"
7. Culture Expanded
8. RICE+EPE Compatibility Patch
9. More Game Rules
10. Unique Building Plus
11. Medieval Arts
12. Unified UI
13. More Bookmarks+
14. MB+ CE
15. MB+ EPE/CFP
16. MB+ MGR
17. A Special World - Special Building Compatch
18. More Bookmarks+ - More Cultural Names

Any and all help would be appreciated.