paint chip =(
 

Car is not even a month old.

on back fender. 3 tiny little dots go down to metal i see.

what should i do to prevent rust?

will take a pic and post it in a few

Use the factory touch up paint.

Here's a video with the proper method, outlined much better than I could.
[ame="https://www.youtube.com/watch?v=6xi3xmeO6C4"]Paint Chip Touch-up -- /DRIVE CLEAN - YouTube[/ame]

just call dealership to order it?

Yeah, it should be in stock in the parts departmemt