Here's a link you can reference when creating cards:
OOTP Baseball Card Templates
As for templates specific to batters or pitchers, you can accomplish that with some creative use of image naming and the position token but the overall design of the card can't change too dramatically. Stats tokens will also only show up for the type of player, so you can use a batter specific token to force something to only show for batters. I'd suggest looking through some of the work other modders have done to see if you can find something that might give you a clue as to what you're trying to do.