There are different opinions re the use of lead vs leather for holding the flint as a search of Forum topics will reveal. :wink:
If you chose to go with lead, you can simply flatten a lead roundball with a hammer & trim the resulting sheet lead to size with nippers or even heavy scissors.
For priming, there are also different opinions re the use of 4f vs the same powder as the main charge - see more forum debate :wink:
If you want to try using the same powder for both prime & main charge, a priming horn is not needed.
In humid conditions, a rag to wipe fouling out of the pan is a good idea.
For cleaning, a supply of round toothpicks to seal the vent when scrubbing the barrel.
I find flintlocks very satisfying & often wear a smile when shooting them............ :grin: