You cannot add this " الاستلام عند الدفع للمشتري " & you don't need to 😁

It's the normal than the customers pay on amazon & then receive the order - or they have the cash on delivery option.

For Part 1: المنتج عندي ليه مقاسات والوان مش عارف اضيفها ... Why ?? do u have an error or in general ?

If In general check ( create variation help page ).