I am interested in selling merchandise online, what information do I need? I have done some research on my own and found out the following but still have some questions that I hope you experts would be able to offer help. Thank you. --> I will need a seller's permit (I reside in Tempe, AZ) --> From the search I did on AVVO, it looks like I will be better off to register as a LLC or something like that? My questions: What information do I need to collect for tax filing? Is there agency/service that can help me with tax filing? I will be selling online primarily so all transactions will be done online. What kind of service/agent/lawyer available for this type of matter? How much are the service fees?