If you're going to be open to the public, you will need liability insurance. You will also need very deep pockets. The first time you can't pay for a load or write a bad check, you are out of business. You need to be able to identify various types of metal or get an XRF gun ($5,000 to $25,000). Then, there's catalytic converters. Computer software will be another major expense. I'd suggest a lot of research before jumping into this. Get familiar with your state zoning laws and record-keeping laws.