So you're looking to strip the lower portion of the car...gotcha! Do you have access to a compressor, spray gun(s), and a place to prime the car? Do you have any friends or family that can instruct you on doing body prep, etc.?
Is the car currently your daily driver?...if so, you may want to do a section, or panel at a time.
If you do have access to a decent compressor, you may want to look into getting yourself a DA sander...however, you can also purchase an electric dual action sander. Porter-Cable makes a nice one. I have one and they work great.