I love supercars and want to open a business to do with them could I have some ideas on what business I could open please?

>want to open a business to do with them

Hold that thought, one day it may actually become a plan, with $100K

Low profit margin, low turnover, high risk. Are you sure you want to do that? If you really want to, you'll have to set up shop in a high cost location. Even then you'll run into problems with existing competition.