1) By default, there are 2 custom tabs: – Theme Options > Single product page > Tabs Settings > Custom Tab (same for all products); – Custom tab content on a separate product page > [8theme] Product Options https://xstore.helpscoutdocs.com/article/68-single-product-page
If you want to add more tabs, use the code from this article in fucntions.php of your child theme – https://docs.woocommerce.com/document/editing-product-data-tabs/
2) There is no such possibility, by default. Please describe the desired order of tabs, and I will check what can be done to help you.
