Will you be turning it into a business or will it just stay as your personal office/workshop? If you will be using it as a business location, you will need to register as a business. You could set up an LLC, which would be recommended if you're going the route of a business. On top of that, you will probably need to obtain an Employer Identification Number, get a business license and more.
But if it's just for a location for your personal office/workshop as isn't meant to be a business at all, I don't know if you have to go through that process. It might be worth contacting the people selling the commercial land to see what steps you need to take and if it's viable to buy said land for your office.