As far as sales tax, you're not responsible, your customer is. They are "supposed" to pay sales tax in their state. Unfortunately, that doesn't go for customers in your own state. Then
you must pay sales tax. If you're planning on only selling out of state (for now), you could just go ahead, but keep good track, because
you must pay income tax. Tax on profits. Keep track of costs, they don't count towards profits. I think you're supposed to pay taxes every three months. If you make squat, then the irs cares squat

. And don't expect your business to soar in 1 day.