Your hammer has a slot for a flat tipped screwdriver or a hole to tighten your flint in place. IIRC, these brown bess locks take the 1 to 1 1/4 inch flints. Track of the Wolf has these English knapped flints in stock usually. It's really nice to have several as flints will eventually fall apart from the pounding they receive.
You might want to get spare leather to surround the flint too. Buckskin is about perfect for this task.
You need a pin and brush to clean the priming pan and clear the flash-hole, between subsequent shots. Make sure the one you buy is small enough to clear your flash-hole. These are a must have IMO, I prefer the all brass one myself because the pin is small yet flexible for getting into tiny corners and the brass brush is superior to the steel pin & hair brush for removing burnt powder. Both styles I've seen for sale at T of Wolf are joined by a short length of chain.
Also if you are going to hunt your gun, get those 'modern' quickloads, for shot or ball in one side and a premeasured powder charge on the other side. No shotgun slugs, your solid shot has to be made of pure lead or plumber's lead BTW.
Don't forget flinters require two differing powders, one for the main charge, one for priming. A small priming measure is really nice for this job. You might or might not want a brass funnel to load your maincharge down the barrel. Short start ball for the initial loading of solid shot. You can get other powder measures that are adjustable for your maincharge.
Track of the Wolf has all of these BP goodies.
Don't ever pour powder straight from the 1 pound can into your barrel, as burning cinders hiding in the barrel from a previous shot, might ignite the pouring powder and you are suddenly in a cartoon. A very unfunny cartoon ending!
Edit: On a similar note don't ever look directly down the barrel after you've loaded it. Darwin Awards have been issued to those that lit a match to see what is down there. Sorry for the safety nazi stuff, lots to watch out for with these neat old timey tools!
Enjoy yourself buddy.....................
