-Create a Gmail account
and sign in with your Gmail account
-Click on the Add Site button and add your website address
-Click on the Verify your site link and select a verification method
Once you are done with this, you’ve access to all webmaster tools (crawling, indexing, sitemaps, backlinks, redirects etc,,). You even have access to webmaster central blog where you get to know lot about SEO.
-Refer to this link for how to setup Google webmaster tools