New surfer wondering about longboarding???

Hey...well currently I'm learning to surf and I am learning on a longboard that my friend is letting me borrow. I am liking it and I think I want to go in the way of longboarding over shortboarding, but I want to know how long I should wait before getting a board. I'm not good or anything, but I think by christmas I cold consider myself a true beginner cus I go to UCSB and literally live on the beach. Al Merricks head quarters are near me and my surfer friends recommended getting a shorter moderately priced merrick too. So should I buy whenever or should wait until I am pretty good or what?