Thank you for your questions.
1. If you can’t find your shop page it is possible that you didn’t set up WooCommerce pages. You can do this in Dashboard -> WooCommerce -> System Status -> Tools -> “Install WooCommerce Pages”
2. Create product categories you can in Dashboard -> Products -> Categories. Then add them to your navigation menu in Appearance -> Menus. If you don’t see them here be sure you have checked them to be visible in Screen Options (top right corner on the menu page).