I just made a tutorial series on how to get started with scripting in GTA V using C#. Make sure to check it out and leave comments. This series teaches you everything from Car spawning to making a mod menu.
If you have any problem, you can post it here as well.
Part I: Basics
Part II: Using Native Functions
Part III A/B: Peds,Relationship groups and Blips.
Part IV A/B: Using Native UI to make a mod menu.
Playlist: Click Here
I'll be uploading all the videos in couple of days. Do leave feedback.