Dashboard > Pages > add new page, then select that page in Appearance > Customize > WooCommerce > Checkout settings.
What exactly links do you mean? Menus you can edit via Appearance > Menus, links in content of pages can be changed by editing pages.
You can use Lightshot screenshot or Gyazo tool to make screenshots and share links here.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.