How often should I wax my car?

[Texarkana]

The scratches are no longer than 3 inches, no thicker than a 1/8th of an inch. Swirl Marks are barely noticable. Could I polish it by hand or should I invest in a good orbital buffer?

 

[Texarkana]

Well I'll take it in the near future to this place:
Services and Pricing | The Gift Auto Detailing Center
I'll have the paint restoration done to it then I'll bring it home and wax it.