Adding a new product

Hello guys, Can you help me with this ?
I wanna add a new product, add the asin , select condition add the info price , country of origin .Once i save it comes back with this :

“You have not submitted any SKUs. Please return to your inventory list and select some SKUs before submitting.”

The items goes to inventory and when i wanna create an shipment i cant print the labes because it’s using the manufactured barcode , and i didnt had the chance to add amazon.

Thanks in advance