MabiPro: The Authentic Old-School Mabinogi Experience

When I created a character, the game told me it would be a better idea to make a Human first, because then I could acquire an Elf card and a Giant card. I'm not entirely sure how to get either of those cards.

Any help would be appreciated.

You would have to bring your human to either Vales or Filia and talk to the chief to make an alliance with them using the keyword. You can immediately un-ally once you got the card but you can only ally to either side once a day in real time.