How much money would my 1991 WCW wrestling cards be worth?

i got a vast collection of wcw wrestling cards that im going to put in my yard sale but i dont know if i will get ripped off on the prices but i dont know how much they are really worth im only missing a few and they are in a card case all seperately in a slot none of them are bent. so can anyone help me i only got a few days untill the yard sale