Remember, Slow is smooth, smooth is fast.
I can tell you what NOT to do! I followed Mark Baker's lead when setting up my pouch and made a little bag for each separate component, and then layered them in the single cavity depending on how often they were used (balls and patches on top, flints, turnscrew, and cleaning patches on the bottom, etc.) After a while I've figured out that it worked for Baker because he had everything for reloading outside his bag, whereas because I didn't use a loading block I had to go through a complicated process of fishing out the patch pouch from the hunting pouch, get a precut patch out from inside its bag, return the patch pouch back and pull out the ball pouch, unstopper it, shake out a ball, restopper and return the ball pouch, all the while handing onto 1) the gun, 2) the patch, and (at the end) 3) the ball. I need three hands, and everything inside the hunting pouch gets disordered.
My own solution for the next gun, when I get it, is to make a pouch with a pocket or divider, and keep the balls loose in one area where I can just reach in and grab one, and flints, turnscrew, tow, etc., out of the way in the other. Not sure what I'll do with the patches yet. I'm going to ditch the short starter too, as I don't think they are even PC for the 18th century, and if I can't get the gun to load with the rod alone I'll put a utility knife on the back of the pouch and use the handle to start the ball (which IS documented!)
Some suggestions:
With a single pouch, unless you are using a bullet board, I'd suggest keeping maintenance stuff in its own little bag inside the pouch, and the balls loose at the bottom, so you can just reach directly down to the bottom of you pouch and grab what you need. Measure and pick can be hung off the strap of your pouch or powderhorn, the short starter can go in the pouch or in a loop outside it.
Don't overlook the patchbox on your rifle! If you have a sliding wooden one you can store cleaning/maintenance stuff in it, if you have a hinged metal one you can store precut patches in it. It is a very, very useful feature that is sadly under-utilized these days, IMO.
See if you can do without the priming horn.