EDIT: Can't post for 10 minutes until I have 1 rep (rep4rep someone?) so here we go:
Thank you to all who took the time to read my post, I understand it's longer than most. Tried to keep it as concise as possible. I understand it's a large request, but I really want to get involved in this community. Looks so fuckin' fun. 
Hello everyone, Aidan here.
New to modding GTA 5. Had installed a few vehicles in the past, but uninstalled so I could go back onto GTA Online.
Well, I've found myself back on Story mode far more often than GTA Online again, and figured I'd really leap into modding this time around. I plan on doing much, much more than a simple vehicle or two, and hope to learn to create my own mods to post in the future.
I am looking for suggestions. Some things I would particularly like include, but are DEFINITELY not limited to (keep in mind I'm new to this, so I don't know what I don't know. Could be many things that I would absolutely love that I don't even know exist yet).
-Better LSPD behavior and models. RDE appears to be broken based on the comments. https://www.gta5-mods.com/misc/realism-dispatch-enhanced#comments_tab
-A vehicle pack that replaces (or adds on, to be honest) 50%+ civilian vehicles with Real Life vehicles (Lexus, Ferarri, etc).
-A Photo-Realistic Graphics mod. I was thinking Project Realism by Your Father. https://www.gta5-mods.com/misc/yourfather-s-enb-reshade
-Perhaps better physics? I hate how grippy the cars in GTA are, and the fact that if you countersteer during a drift you instantly straighten out, rather than hold the drift. I would love to be able to drift on this game, but only with vehicles that would drift in the real world. Aka, I don't like slidey cars. I essentially just want real-world physics, with a couple cars powerful enough to maintain wheelspin through a turn, at speed.
That's all I have at the moment. Eventually I'll add things such as clothing and weapons, but those 4 things would increase the playing experience by a THOUSANDFOLD.
Any suggestions on where to start? Need to learn how to install mods. Looked at tutorials on here, but they're not very beginner-friendly. I know nothing (yet
)