56 is kinda an odd bird some where around 26 gage . IE its alittle bigger then a 28 but not a large as a 24 . But I would bet that the actual bore size is closer to a 28 gage . If so then Track of the wolf sells wads and cards for the 28 and 24
frankly you dont have to use wads and cards . you can use just wadding and do quite well with patterns if you work a load .
wadding also can be just about anything from old wool, to hemp , tow even green leaves will work in a pinch . Killed many a grouse with my 28 gage , loaded with nothing but shot and leaves for wads .
just push the wadding down over the powder , then add your shot . then wadding over the shot so as to hold it in place .
if you want to make wads and card , make your cutter .010 over bore .
a cheep deck of playing cards will yield a near endless supply of over the shot cards . for wads you can use just about anything IE old wool blankets , worn out felt hats even fiber carpet pad . myself i have a roll of old horse hair carpet pad that i punch wads from and for thicker wads i have a couple old horse hair saddle blankets that I picked up at a yard sale cheep .
Later if you really want to get down to the nuts of working a load then you may want to try an over the powder card .
That makes you load , powder , over the powder card , wad , shot and then over the shot card .
The over the powder card is a real heavy thick card that helps protect the wad , which acts more as a buffer .