You get 4% of each sale and it increases as you make more sales. https://affiliate-program.amazon.com/
for each sale you will be paid 4% commission. and it may go upto to 6% if you could make more than 6 sales in the month
There are also certain site you can promote and make 15%. Amazon will accept you even if you only have a Twitter account.
Since Blogger comes integrated with Amazon, you can get the registration done easily if you open up an account with Blogger.
There are lots of types of amazon accounts. What types account you want to get that will be first question to you. I can give you some examples. 1. You can sign up as a customer account to buy product and give product reviews 2. You can sign for some affiliate work. etc etc.
make sure you dont sign up with a trademark name in your domain name linked to the account eg sonycameras.com this will get your account refused. use something generic like bestdigitalcameras.com