Good: You asked also, how much powder? I am assuming the question pertains to recommended loads for your rifle?
You will need an adjustable powder measure that measures powder by volume, not by weight. You can find them available from many suppliers. Check TOTW's website, and on-line catalog to see what is available. I recommend buying one of the two box designed Tedd cash cappers. One looks oval in shape( I have it) , and the other looks like a huge comma ( , ). Both are well made, available in brass or silver plate, or steel. You can buy cheaper " stick " cappers, but they expose the caps to lint, and weather, while these cash cappers will protect the caps from everything.
As to powder charge, you can do credible target shooting and small game shooting out to 25 yards with loads as small as 22 grains of FFFg. However, you probably will want to start at 45 grains and work up and down a bit, in 5 grain increments. When I was shooting a short barreled .45( 25" barrel) I settled on a load of 50 grains of FFFg powder, and got fine accuracy at 50 yards. My brother has a new 37" barreled percussion .45 that likes 40 grains for target work, and will shoot 60 grains at 1950 fps, which is up there in the gee whiz category. All that velocity is lost fairly rapidly, but the ball will hit 12 inch gongs at 135 yards all day long with that load. If I were going to use your gun for hunting deer, I would use 55-60 grains of FFFg, aiming for accuracy, and limit my shooting to no more than 60 yards. In heavy woods, 60 yards is a long way. Most deer are shot well under 50 yards. My shortest shot was 6 feet!, and the longest to date was just about 40 yards.
I hope that information helps you with a starting point. There are many different sized .45 caliber rifles but from the information on this site, I believe you can do best using .440" caliber lead balls, and a .015 lubricated patch,with your T/C rifle.