You are notified if another business already has that name, so you can select a new one. A good business plan should include a description of what you are selling, who the prospective customers are, how you plan to promote, and how much money is need for start-up costs. Put together a simple and effective bookkeeping system for income and expenses. Use a pocket divider for each month's receipts, bank statement, deposit tickets, and canceled checks. Call several banks to find out what services they offer.
Bank fees can be significant, so shop around for the best deal.
It's very important not to overlook any necessary license or permit. Some cities and counties require a general business license. If the product or service you sell is taxable, you need a state sales tax permit. Creating and operating a small business is a wonderful and rewarding challenge. The satisfaction is not only in the money earned, but in doing what makes you happy.