No disrespect, but painting as a special technic, and it takes lots of years of experience...But if you want to do it here's some suggestions...
If you have a good compressor, use it to remove all the dust possible in the garrage, then use scotch brush to sand your car or water paper (less dust). No need of primer if you did not touch metal, use the compressor again to remove the dust, and use a stiky tissu that you can find in a local car paint dealer to remove all the dust possible, it has to be like a baby skin!, After, just before painting, put some water on the floor so the dush will not come up on the car, Tha is an old technic but it's the best stuff I've learned...
Anyway if it's your parents garrage, you will have to pay to get it clean! it is gonna be the same collor of your car! And the smell will stay for minimum a week...
Vince. ( I'm a body painter....)
