Hey man, imo the most important cards in the beginning are cold pizza slices and pizza boxes so you should get at least 2 of each since they'll allow you to do more missions every day, then you can prioritize reaching lvl50 and getting the starbits millionaire card since 10k starbits per day is massive and it pays itself back quickly even if you bought some of the starbits (just don't buy them when they're x1.5 the usual price like I did lol.) Enjoy the game!
!PIZZA