Oh boy...... where to even start. I want to help you because I remember where you were at one point. I truthfully was so overwhelmed when I initially started but I scoured these pages and forced myself to read and pick up little tips as I went. The key was attempting to the best of my ability and failing many times until the little things all made sense. Unfortunately you likely will need to do the same. It is absolutely impossible (for me at least) to write out in a post how to do this. But I can give you a great starting point and basically a MUST if you are going to mod
1. Make a mods folder in open iv !!!! Google “lcpdfr mod folder” or something like that to get a description
2. I make a separate folder on my desktop for all the original files. If you change ANY file at all, before you do drag that original file out of open iv and put it into your backup folder. That way if something goes horribly wrong or your game crashes (it will happen many times while you are starting off. Get used to it) you will have the original right there to replace
3. Only make one change at a time and then load up the game to test. That way if it crashes you know what files caused it
4. Youtube “how to add real cars gtav” in Youtube. The author is firstthirtyminutes
it may or may not be outdated a little but the basics are there.
This is my take on it. These steps seem basic and aren’t exactly what you asked. But if you don’t do them first , don’t bother trying to add cars.