Because you are selling goods and services you may be responsible to collect sales tax for the transaction. Sales tax is owed to the state you are selling into, not the state where you are located. Each state has their own rules regarding sales tax. Some states don’t collect sales tax at all. There are several external services that will help you determine sales tax. If you are unsure use one of those services or contact the state tax agency in the state you are selling into.
This all sounds very complicated, but we are working on a solution for you. Shortly we will have a solution for sales tax integrated into our software, which you may use. The service is optional, but the requirement to collect sales tax in states that have it, is not.