Not a powder measure like you have on your loading bench for smokeless. Measure makers worry a lot about sparks off of steel rotors, static from plastic hoppers, and who knows what all setting off black powder, which is capable of actual detonation, unlike smokeless. A muzzleloader measure is just a brass cylinder, some with a sliding adjustment, some with a little funnel attached. You can make a dipper out of a empty case with a handle glued or soldered on. Or just use various empties as measures, pouring into them out of a flask (You can get nozzle caps to use the powder can as a flask, no need to buy a horn or brass flask.) Calibrate by weighing.
Patches for round balls should be good stout fabric of natural fibers, cotton will do nearly as well as linen, but use pillow ticking, pocket twill or some such, not a soft cleaning patch. No synthetics whatsoever. You can lightly grease a patch with Bore Butter or even Crisco - not a petroleum product - or, for target shooting where you are going to load and fire right away, a spit patch will work as well or better. Just pop the patch in your mouth and roll it around until it is well dampened with saliva.
Get a Dixie Gun Works catalog, there is a lot of sensible advice in it.