Can someone explain Product Packaging rules for my Private Label product?

Hi everyone! I am starting out a private label brand in bedding category and I am in the process of design production for the product packaging. I will be importing them from China under my branding, my logo and my own package design.

What are the common rules for product packaging?

Can I put company's email address for customer support? Like "If you have any questions regarding the product, please reach out at customerservice email"

Can I put my company's website on the packaging box?

Can I put generic picture on the product packaging box? (Picture on the package will be slightly different than the product itself, since I don't have the actual product in hand, it is in production now). I will have the actual pictures of the product once I receive them already with the packaging box I am designing now.

What info is allowed or what info is prohibited on the product package?

Thank you all in advance!