To start a business, you must register your business in any state of the USA as an LLC. After that, you can obtain a seller certificate, which signifies that you are allowed to sell products in that state. You also need to obtain an EIN (Employer Identification Number) and purchase a business address, which you have to renew annually. Now, you are ready to start your business, specifically a PL / Wholesale business or whichever is what you want.