This may be long, but I divided in 3 sections, so you may skip I. (what happened) and III. (the mods I tried using) and just read II.

I. My short story:

I've been hearing about The Elder Scrolls series and specially Skyrim for many years, yet I never gave it a try. Not because it didn't interest me, but because I was afraid my PC wouldn't run it.

I recently got a better PC and Skyrim Special Edition and decided to play for the first time using 20 mods. I read the beginners guide and saw some videos, as impatient as I am, and this is what I did (You can skip to "II. Help me", as the important questions are there):

1. I downloaded and installed SSE;
2. I manually added the Script Extender in Skyrim folder;
3. I installed Mod Organizer 2 and LOOT as my mods managers and downloaded a few through Nexus using the Vortex option, directly into my MO2, in a mod folder in C: (Skyrim is also in C:);
4. I installed and I ran LOOT, in order to organize the load order;
5. I played the opening until the MC was able to find a way out of the dungeon, and I was able to get only 1 mod working: The world map one.
6. Some mods, as Inigo, weren't even recognized by MO2, as it was flagged as being another game mod;
7. Some mods were in conflict (Sounds of Skyrim - Civilization and SoK - The Wilds);
8. Some others were flagged, yet I couldn't see the issue;
9. I kept hearing Vilja's voice lines when I was running away with the imperial guy;

There are so many versions of Skyrim and the Nexus' mods don't specify if they are for LE, SSE, Classic or VR, so I may have downloaded wrong mods.

LOOT displayed 2 error messages, as RaceMenu didn't work, apparently because my SSE wasn't updated. Which is strange...

II. Help me!

I'm frustrated and confused... Do I really have to spend even more time reading about modding in order to enjoy the game? I spent hours reading and watching and it wasn't enough.

I know I'm too impatient, but I just wanted a few simple videos that I could watch that would hold my hand, guiding me step by step, so that I could play using my 20 mods without any problems for the 1st time.

After finishing the game once I would be familiarized with the game and the mods and then I could try using more difficult mods to install. I don't want to have a PhD in modding so that I can play Skyrim (at least not yet). I modded other games in the past and it was so easy. (Civ5, KOTOR 1 and 2, The Witcher, et al.) All I needed was about 1 hour of reading for each of them and I had no issues.

III. In case you want to know what kind of mods I used:

Skyrim Script Extender, Mod Organizer 2, Load Order Optimization Tool, Unofficial Skyrim Patches, SSE Engine Fixes, Cutting Room Floor, Sky UI, RaceMenu, A Quality World Map, Better Dialogue Controls, Simply Better Movement Speed, The Choice is Yours, Sounds of Skyrim - Civ and Sounds of Skyrim - Wilds, Immersive Citizens - AI Overhaul, Interesting NPCs, Inigo, Vilja, Immersive Weapons," Armor, Cloaks of Skyrim, Convenient Horses and Voyage to the Dreamborne Isles.

Thanks in advance for anyone patient enough to read this and help this poor soul.