Help me understand Amazon Affiliate?

I understand how the concept is about affiliate affiliate , users goes to your site and if it buys from amazon from your ref link you get some % of it .

I also understand that you have 3 months to sell 3 products and if you don't you are out. So here's my plan and my questions.

First of all, if I apply for Amazon Aff. can I pick any product that is on amazon and review it?

If yes, I'm thinking on picking some products (I already found the keyword) and reviewing it and adding them to my…

Help me understand Amazon Affiliate?