How will you be a tax collector? Are you under the impression that you will have to write a check to the government for the NRST on your purchases? If so, as you said, you need to read the book. And the actual bill for that matter.
That would be bassackwards.
Since there's two sides to a transaction, it's a safe assumption that the person or company who collects the money accounts for and pays, the tax to the government.
If you take a salary from an employer, that's one thing. If you're self-employed or collecting income from investments or a retirement, an estate or a family member -- God help you.