I couldn't find an answer anywhere and I don't really know how to put my questions too, so I gotta write it here.
Yesterday I downloaded wordpress from wordpress.org and unzipped the package. I out the whole folder named wordpress in my localhost folder (I am using windows). I ran install.php and set up database and it works just fine. But basically I cannot create anything visual. When I go to wp-admin/index.php, it shows me the dashboard, and i would click on Customize Your Site. And I would see my screen like this: https://i.stack.imgur.com/aNFm8.png
As you can see there's nothing on the right side.
Then when i try to change something and save and then click on visit site, it takes me to this page https://i.stack.imgur.com/QFz4t.png
I am really new at wordpress so I dont know what's going on. Could someone please tell me what's happening ?
Thanks!!