WrestlingTradingCards.com - Checklists
When I first dove head first into wrestling cards in 2009 I spent a lot of time on this site.
I think you have to be careful just using the first card as many came out first in the paper card sets. On a technical basis they are the first card but since they are newspaper and not card stock I prefer using the first actual trading card. Others feel differently and you must make that determination yourself.
The other major issue is scarcity. For example the first Road Warriors card is the 1985 Wrestling All Stars magazine card which is closer to a real card then the other magazine sets. I prefer using the Carnation card for The Road Warriors as it is virtually impossible to find and the card is from a very similar time frame and is a real card.