Can any one tell me some basic mods I can do that aren't too expensive but will make my car sound and look great but on a budget this is my first car and I do have warranty that I don't want to void and I want to learn as much as I can about The 380

For sound, the basic cheap mods are a 90 mm Galant intake snorkel and a Berklee BS0655 rear muffler.
Not only will these mods improve both the intake and exhaust sounds, but you will gain small improvements in power, torque and drivability.
Heaps of threads on here about these two mods.
For looks there are lots of things you can do but few of them are cheap.