Hello,

1. You should create size attributes and then define them in the product settings, more detail in the below documentation:

https://woocommerce.com/document/managing-product-taxonomies/#product-attributes

https://iconicwp.com/blog/how-to-manage-woocommerce-product-attributes/

2. Could you please describe in more detail what you are trying to achieve with “kind of shipping”?

Kind Regards