At, first you have open to your GMAIL ID which ID you are going to save your google site.
Then, you have to go to the google app at the upper right corner and from many apps choose "GOOGLE SITES".
If you press google site you will be in a page where you can see many option, choose the "blank" one.
After choosing the blank one it will open a new site which ready to design.
Add content to your site as your need.
At the top right, there is a Publish button, which you have to click it to Publish your site to the internet.