I'd start with a .440 diameter ball and pick up both .015 and .018 thick patches...I'd also start with FFF Goex and as a starting load go with 65grs of powder and once you find out which ball/patch combo she likes move up to 70 and then 75grs of powder...Any of those three charges will do for deer...
When I had a .45 I also downloaded to 40grs for squirrel hunting...It's necessary to shoot them in the head so sight her in for 25 yards with the lighter load and then see what she does at 50 with the heavier loads...I like to have my flinters set at about 2 inches high at 50, then you are dead on at 75 and about 2 inches low at 100...
When it comes to patch lube, I used SnoSeal for 25 years or so and it will work well for you...I started making my own a few years back but SnoSeal will do just fine...
Most importantly...Order some Black English flints from Track of the Wolf...Go ahead and get 12-15, they are expensive but they work better than the cut flints that T/C sells...If the pan doesn't go off, you are dead in the water...They have a size chart on their website to help with the size flint that lock needs...
Also, play with how much priming you put in the pan...Some guns are picky, depending upon touch hole size and it's location...I prime with FFF and FFF also goes down my bore, even with my .54...
Some shooters make a big deal of cleaning these guns...I swab with a lightly dampened patch between shots and then a dry patch...This keeps my groups consistant...I just use a spray bottle of rubbing alcohol or just buy a pack of baby wipes for the dampend patch, just tear to size...
When ready for the final cleaning, I put a tooth pick in the touch hole, pour in some luke warm water, put my thumb over the muzzle and tip over a few times...I then pour the water out and most of the fouling goes with it...I run a couple of patches down the barrel and repeat...I then run enough patches to dry and run a couple of alcohol patches down and dry...I then spray the bore with WD-40, dry and finally run a lightly oiled patch down and I'm through with the barrel...
I then take the lock off and either take it to the sink and run warm water over it and clean with a tooth brush or clean by spraying it with rubbing alcohol...I'll then dry and spray with WD-40, wipe off and spray with a can of compressed air and I'm through...