Whenever we talk out SEO friendliness of any website first thing we should think about is the URLs. URLs play big role in any website’s SEO score. If you have SEO friendly URLs half of your work is done (don’t take it literally, I am just giving example).
So for creating SEO friendly URLs first thing we have to do is install URL Rewrite extension on our IIS. You can get one from here. You will find different option for downloading and installing extension. You can choose if you want to install using web platform installer or standalone installer. You will also get samples at the bottom of the page linked above.