I have an online business based in NJ in which I sell a product that I have physically put together and sell  along with with a service (separate price for product, separate price for service). I sell to 9 different states. Do I collect sales tax at NJ sales tax rate and remit to NJ only or do I have to collect sales tax for each individual state at each states sales tax rate and remit to each individual state? I do not have any physical locations or any connections with any state other than NJ.