After recent events, I've decided to finally get a buffer. However, I don't know **** about them, or how to work them, or anything. Can anyone give me some tips on how to use it, what speed to set it on when using it on my car, etc.? Also, is there any certain type of buffer I should look for, or are they all the same? I mainly want it for my car for getting scratches/swirls out, waxing, etc.