I have observed that many of the blogs or websites who have the amazon affiliation on the topic they are writing so how could i get when i can write and gonna make a blog.
Go to amazon and sign up as an affiliate. Then you can blog about their stuff and get paid when people buy it.
+ this comment: blog is one of the most effective sources for promoting amazon products, amazon affiliate program demands that you posted affiliated links to your products. If people buy smth while going with those affiliate links to amazon, you earn money. If they just visited amazon with those links, but haven't buy anything you also get smth (i'm not sure here).