This year I’ll put together a spreadsheet to keep track of things. I still have stamps from when I last corresponded with folks, though I’m not sure if I have enough for the whole month.
I also have my usual big old box of business envelopes from Costco.
But I have to scrounge in the attic for my wax seal and the wax of course… not critical but nice.
I should have enough stationery but I know for sure I have some fountain pen friendly junior legal pads. Those aren’t as intimidating as facing the big blank page of a typical legal pad.