You donot have to post all your urls to google. It is easy.
First go to the google webmaster tool and add your blog as a property there after that verify your blog.
If you already done the above steps, just click on the title of the blog on webmaster tool and then click on sitemap button available there.
Then at the top right corner you will see a option Add/Test sitemap, Click there. You will see a blank space followed by your blog domain name. In the blank space write or copy paste the following and click submit. It may take upto one week to index your all blog components to google.