You might start out with some simple 'Happy Birthday' cards and maybe a
'Thank You' here and there. But pretty soon you'll be making cards for
every occasion you can think of... who doesn't love a handmade card for
National Cupcake Day?
If you happen to be stumped for ideas, I've put together a list of some fairly well-known occasions that folks like to receive cards for.
There's many more (of course!) but this gives you a good place to start. Maybe you can pick two or three ideas from this list to start with, and work your way towards those lesser-known holidays as time goes on.
National Holidays are great occasions for sending cards as well! Here's a list of holidays you might consider sending out a special card for!