Data tracker

I am starting a small (2 person) business and need a data base to track inventory, sales, provide invoices to customers, track sales tax and shipping charges to us and by us. It is for a small company, so doesn’t have to be too fancy, but would like it to be easy to use. I would also like reporting built in. I am open to suggestions. I don’t need to track anything for employees. I would like the products (less than 15) to be in drop down boxes.