that's really a good move, congratulations!

You are one of the few who will apply "Learning BEFORE doing" (the only way to survive on Amazon) and not "Learning BY doing".

Go in your seller central, scroll down to “Learn”, click Seller University and watch all the videos. That will take 2-3 months. Selling on Amazon needs a lot of learning.

Read this forum daily. In the beginning all we sound Chinese to you, but after some weeks you will begin to understand more and more.

Write keywords in the search bar in seller central and study the help pages that show up.

Once you THINK having understood the basics come here again for specific questions. If you don't do all this, your account will be suspended without doubt soon or late.