If you’re in the US, before publishing you will want to create a company to sell the title under. One of the better reasons is due to taxes… as an individual selling stuff, your taxes at the end of the year will be a mess - additional income taxes, expenses, etc… Creating a company provides tax benefits, especially if you’re a start-up. Not too mention you can be eligible for additional grants and loans.
As far as sole proprietorships go, I would stay away from those, as they do nothing to protect you. Instead, incorporate as an LLC (limited liability company).
Also, don’t pay any attention to internet lawyers; go see a business lawyer to get your “ducks in a row”.