collecting cards

Tweet

I was wondering if there are any serious card collectors out there and if so, where do you go to look up the values of your cards. I am a small time card collector and I ran into what I suspect might be a future find. The Scranton/Wilkes-Barre Red Barons are no more...they are the new Yankees. Well, I bought an unopened pack last year of trading cards marked AAA Line Drive Pre-Rookie-91'. Any ideas on what the value or future value of these cards might be? Any help would be welcome. I can't even tell you how many there are since the pack is still unopened. First card on top is Sal Agostinelli. Once again, any help would be welcomed.