Got approved by email for United CC and would like to purchase flights. However, I do not have my actual credit card package in mail yet, so I don't have the full number. I am not sure if I can purchase a ticket now, and if I can, who do I contact to do so? Also, when I make my purchase of flights, I want to make sure the 300.00 credit is applied. Has anyone done this and know the steps? Thank you!