YoHoo

see I am gta 1.0.2845.0steam
rage 1.1041327.16500public.  green to go! 🙂
 

Poo.. wrong tree to bark up for age being a thing. I am no 20 something myself.. or 30.. beyond that.. nunya 😄 
let me get a screen of my file list to show you. This is what it should lookie like
 

mmmm.. I do not think if RS launcher or STEAM makes a difference once your RAGE is in. 
Your log should be the same data location as I posted, minus STEAM if not acquired there.. 
But I have no idea if there is any difference in using that launcher.
Yes.. it can be frustrating starting a new modding trip. Believe me.. I have over 4k hours between old rim and SE rim. I know the perils and tears of modding and creating mods. 😄 
Walk away, take a break. Have a cuppa. Give it another look after a pause 🙂 
Meanwhile.. distract yourself. I recommend dancing and wine. Or <censored by PIA>. It always helps. 
If you can figure that log location out.. do post it. 
If need be I ll pull in a pro at this stuff who is a mod. 😄 

you didn't waste my time.. I am helping to add a new officer 😉
second.. you have tried this game with mods before. did you totally clean it all out with a verification of game on steam? Or even better.. delete everything.. the whole game folder and uninstall and reinstall. If you had any corrupt files from trying.. it screwed you.
Even better.. do you also have your rage log?
Posting it here can help me or more so.. the support mods. 
SteamLibrary\steamapps\common\Grand Theft Auto V\Logs

You do need / want both scripthooks.
There is your first misunderstanding of OPENIV and still EUP. There are only 2 parts that go in OPENIV. Mess up any of the 3 and you screw the game. And probably your single player to. You will if your replacing cars etc outside of mod folder. The instructions for ( to stay with EUP for training) are right there on the page or readme for most mods. Like mine. I basically include an dummy's guide to how to add. ( Mostly because when I started.. people were notorious for releasing a mod and just assuming you knew what to do with it. That f*qing sux) 
From EUP:
 
Installation:
1) Place RAGENativeUI.dll into your root GTAV folder (if you don't already have it).
2) Extract the contents of Plugins in the archive into your GTAV Plugins folder.
3) Open the RPH console in-game (default F4) and type "LoadPlugin EUPMenu.dll" (without quotations).

THEN you add Law and Order via OPENIV 
THEN Serve and Rescue. In that order 😉 
But again, he is really good for easy and good instructions. 🙂
Most are! 


your hooks go in the main folder for gta v 

SteamLibrary\steamapps\common\Grand Theft Auto V

Then your ready for basic patrols in the world.. and much coffee and bullet holes. 
 

Don't overthink it much. It only sounds daunting as your new. Believe me, once you do it your like.. oh snap. Then it just goes. Not a hard learning curve, it just seems it looking in from the new side. 😉