Track of the Wolf is one of the largest suppliers for builders yet still has reasonable prices.
http://www.trackofthewolf.com/(S(se0pb1mk0mpksy55mq4kda55))/Index.aspx
The site can be hard to navigate at times, but it's worth it.
Call them if there's anything that you need but can't find on the site.
If you like shooting the pistol, you can make or buy a
loading stand to hold the pistol upright while loading.
An adjustable
powder measure is for measuring the volume of powder.
A
powder flask helps to dispense or pour the powder into the measure.
You need the right size
balls and Track has one of the best selections of ball sizes.
If the bore is really .44 caliber then .429 balls would seem to be right.
http://www.trackofthewolf.com/(S(se...es/tableList.aspx?catID=2&subID=25&styleID=58
Either buy lubed
.015 patches or dry patches and lube them yourself with TC Bore Butter.
Bore Butter is also a patch lube and bore preservative for after the bore is cleaned.
Nipple wrench is to remove the nipple for cleaning. If you dry ball (forget to add the powder) you can remove the nipple and tap a few grains of powder into the drum to shoot the ball out.
A
nipple pick, thin piece of wire or sewing needle serves to clean debris out of the nipple's flash hole to keep it open for flame to pass through.
#11 percussion caps.
Slightly undersized cleaning
jag and/or a bore brush.
Patch worm to retrieve patches that come off and become lost down in the barrel. It looks like hooked wires and will fish out cleaning patches from the bore.
A
cleaning rod or ramrod with a threaded end that will accept the ramrod accessories. The threads are usually 10 - 32 but there are thread adaptors.
Short starter to start the patched round balls into the muzzle.
Capper holds caps and makes it easier to place them on the nipple.
Powder.
Not all of these items are absolutely necessary and there are homemade alternatives for some of them, i.e. - like using any gun cleaning rod, but at least protect the muzzle crown with a muzzle protector or something similar like a piece of plastic from an empty tub of margarine.
An adjustable powder measure is probably the most important item to get besides balls, patches, caps and lube, but using the right size brass cartridge case can also serve the same purpose of measuring out a fixed powder load.
But a nipple wrench is preferable to using pliers.