SimplisticDesigns

In-game resources are a really good place to start.

mods\update\x64\dlcpacks... Should be a eup folder. If not reinstall.

Firstly I would recommend how to 3D model using something like blender. It's free and can allow you to edit and add to your models freely. It also give you the knowledge on how everything works in the modeling field and can make it a bit easier to work with zmodeler (which can be a giant pain).
 
The main thing to learn is Zmodeler 3, which is used to put all your models into GTA. It also allows you to create cars and stuff like that. You can find tutorials for bender but it's kinda of a mixed bag when it comes to Zmodeler. I wish you the best on your endeavours, and if you need any advice or any more detail feel free to PM me. I'm sure HANAKO can give you their take on it as well.

Both the LSPDFR Trailers on the G17 media YT Channel were released on the 29th, which means it will be released on the 29th of February... 2020? 🤔.