Selling on Amazon and taxes are pretty confusing, luckily Amazon has a cool service that will collect the taxes from buyers for you. This way at the end of the year you will not be paying this tax out of your own pocket!
For the full article on Amazon FBA Taxes and Nexus visit here - http://www.passionintopaychecks.com/amazon-fba-sales-tax-nexus/
Taxjar State Tax Settings Chart - http://www.taxjar.com/img/guides/amazon/fba-sales-tax-chart.png