Hi there,
Your question isn’t completely clear to me but I am assuming that you have WooCommerce installed on your site and need to create the Checkout page.
When you install WooCommerce it should create the pages you need for your shop automatically but if, for some reason it doesn’t complete you can create the pages yourself.
This process is well described here:
https://docs.woocommerce.com/document/woocommerce-pages/
If you want to automatically create the required pages you can go to WooCommerce > Status > Tools and use the page installer tool.
In particular, and directly related to your question, you can create an individual Checkout page simply by creating a new page and adding the Checkout Shortcode to it in the editor:
[woocommerce_checkout]
Have a read of that page I linked to and get back to us if you need further help.
