You seem dressed just fine to me LOL, what am I missing?
As for the draw, keep in mind most 19th century (and early-mid 20th century) shooters never used two hands.
As for your groups, what I would do is first and foremost slow down. What you want to do is work up a load for your New Model Army that is accurate, and you know it's accurate because you've shot it off a bench.
Experiment with different powder loads etc. till your NMA is hitting true. You also might find the gun will group well, but the sights aren't on. There are ways of fixing this, if this is a problem look up how to adjust the sights on a NMA.
After you're sure your gun is shooting true, it's time to work on your shooting technique. I recommend watching some videos on proper shooting stance for single action revolvers. You might also do well to learn the basic fundamentals of handgun marksmanship. There are plenty of videos as well as in person classes that you can go to that will help you out a lot.
Also, as for cleaning between cylinders, you might find that some lubricated felt wads will help a lot. These are little felt discs soaked with lubricant that you place between powder and ball. When fired, the greasy was literally smears lube all over the bore with each shot. This will keep everything nice and lubed, and when you go to clean the gun it will clean up MUCH better than using no lube at all. They are also way cleaner and faster to use than just smearing bore butter or Crisco over the chambers, you should certainly look up "lubricated felt wads", you can either buy them pre made or make them yourself, which is surprisingly simple. Thank me later.
Good luck on your shooting quest, just make sure to slow down and focus on making good shots. Take care!