Questions about selling a WoW collection

Hello.
I've an older WoW tcg collection that I haven't looked at in years. I suspect its about 10 to 12 long boxes of cards from the first six sets of the game. Because I haven't looked at this in so long I think its time that I consider selling them but I really have no idea where to start. First of all, did the game hold its value? Is there any chance that the cards are worth more than the cost to ship them?

I'd be grateful for any tips or pointers from anyone out there that's done this kind of thing before.
Thanks!