E-commerce – Usablity scenarios

I'm doing some usability scenarios and would like to clarify some doubts.

Scenario - Add product to stock

A new pair of shoes arrived from the supplier. Please publish the shoes information on the system.

Details that need to be filled: Title, Price, Register date, Id, Description, Supplier, Supplier email, etc.

Doubt: Given that we want all the sellers to provide all the information mentioned above so as to keep the site and the info about all the products consistent, should the notification provided above read something like this?

A new pair of shoes arrived from the supplier. Please publish the shoes information on the system. The name of the shoes is "abcd", the price is "50.90", the description is "....", and so on.

Scenario - Where to put the login trigger?

Doubt: To buy a product and edit account info we need to login. Where should the login be triggered?