Follow the steps on the website
It is easy to sell on Amazon just need to register sellercentral on amazon with very simple form provided by amazon. After registration you have to list your product that you want to sell. Just follow the easy steps on seller portal and publish your product on Amazon. It is very simple.
But if you need to learn proper about selling on amazon then you need to join Amazon FBA Ninja course provided by Officialkevindavid, it is guiding you about selling on Amazon step by step. It is not only helping you to selling on amazon but also helping you to selling more and making more profit. It guiding you how to list your product on Amazon, what are the basic technical things need to be added in product description that helps you to get more sale and profit as well.
Im not sure i think yhe second one is more thorough