Newbie, must haves for Assetto Corsa?

I'm new to sim racing, as id I just built my first sim rig 2 days ago. Assetto Corsa went on sale on steam so I grabbed the ultimate addiction with all the DLC cars, I think that was the right version to get?

I have a beefy PC, 9800x3d and 4090 so I want some visual mods to make it look more modern.

What are some must have mods?