If you plan to sell goods or services in a physical store, you will likely need to obtain a seller's permit, also known as a sales tax permit or reseller's permit, from your state's tax agency.

A seller's permit allows you to collect sales tax from customers on behalf of the state and remit those taxes to the appropriate tax agency. It also allows you to purchase goods from wholesalers without paying sales tax, as long as you intend to resell those goods.

To obtain a seller's permit, you will typically need to follow these steps:

1. Register your business with your state's Secretary of State or similar agency. You will need to provide information such as your business name, legal structure, and contact information.
2. Obtain an EIN from the IRS, if you haven't already done so.
3. Contact your state's Department of Revenue or Taxation and follow the registration process for a seller's permit. You will need to provide information about your business, such as your EIN, legal name, and business address.
4. You may need to provide additional information, such as a business license, zoning approval, or proof of insurance, depending on the requirements in your state.
5. Once your application is approved, you will receive your seller's permit, which you will need to display prominently in your store.

It is important to keep accurate records of all sales and taxes collected, and to remit those taxes on time to avoid penalties and interest. A qualified accountant or tax professional can provide guidance on sales tax compliance and help you navigate the complex tax laws and regulations.