1kperday did a nice video on what you need to shoot a BP revolver:
duelist1954 - Mike B. has many great videos on shooting BP revolvers. Here's a few to check out.
In his loading video he uses the powder measure to load the chambers. This is the safest way to do it but it really slows everything down.
In all his other videos, he loads from the powder flask.
I load from the powder flask.
The fear (irrational or otherwise) is that a spark could be sitting in the bottom of the chamber waiting for you to put that powder flask near it.The flask could then (in theory) become a grenade in your hand.
When shooting, I move my powder and powder flask and pound of black powder away from (behind) my immediate shooting area.
Above is my Pietta 1860 Army and almost everything I use to shoot it. Not pictured is a 1 pound can of Graf's Schutzen FFFg powder, a powder measure, Remington #10 caps, a nipple wrench, and a tube of Thomson Center Bore butter.
Here's all the accessories I use and examples of them from the web. Shop around you might find some of these at Walmart, Bass Pro, or Cabela's for less $ than what I'm linking here.
Real black powder can be difficult to find locally, very few gun shops carry it as it requires special storage requirements. Call around.
Bass Pro advertises that they carry it. You have to ask for it as it's not on the shelf nor near the gun area. A clerk needs to walk and get it from their secure location. I have Bass Pro's HQ store in Springfield, MO. They rarely have it in stock. When they do it is the most expensive BP around. A local shop carries BP in Springfield and beats Bass Pro on the price of a can by $10 or more.
Walmart usually carries substitute powders. Pyrodex P and RS will work. Triple 7 FFg and FFFg will work. Real black powder is more fun and can be less expensive.
Pietta cap & ball revolvers work best with Remington #10 caps. Problem is they are hard to find right now.
I shoot Hornady .454 diameter ball in my 44 cal Pietta revolvers. This will shave a ring when you load it and is the perfect size for Pietta revolvers.
http://www.cabelas.com/product/shoo...er-pistol-round-balls-per/739962.uts?slotId=0
Wool Felt Wads - 44 cal. I load powder, wad, ball.If I don't have wads, I will shoot lube over ball. I also like to experiment with powder, wad, lube, and ball.
http://www.cabelas.com/product/shoo...-powder-revolver-wads-per/706908.uts?slotId=5
I've started making my own wads and lube:
http://1858remington.com/discuss/index.php?topic=11514.0
Bore Butter - I rub a dab of this on the arbor (AKA cylinder pin). This will allow the gun to keep shooting for days. I have also been putting a dab between the wad and ball.
http://www.cabelas.com/product/Thompson-Center-Natural-Lube-Plus-Bore-Butter/728389.uts?slotId=0
Nipple wrench - needed for cleaning the revolver:
http://www.cabelas.com/product/shoo...-wrench-with-six-nipples/1739303.uts?slotId=1
I find the barrel wedge on my newest Pietta 1860 Army is almost impossible to get out. A mallet and a punch will get it out.
Video by Pietta on removing the barrel wedge:
The flask that is pictured above, I bought at Walmart - it has a 30gr spout which is perfect for the 1860 Colt.
https://www.midwayusa.com/product/1002225580?pid=711044
Ted Cash capper. These can be a little tricky to use at first but are easy to get the hang of.
http://www.cabelas.com/product/shoo...pistol-and-rifle-cappers/740649.uts?slotId=16
You'll want a powder measure to check the spout on whatever flask you buy. Here's an example similar to the one I have. This price seems extremely high to me - shop around. Walmart carries these. Get a rifle sized powder measure as you can use it for both a pistols and rifles. No need to have 2 of these.
http://www.cabelas.com/product/shoo...-revolver-powder-measure/733537.uts?slotId=41
I'd recommend you get a set of gunsmithing screw drivers. This will keep you from munging up the screw heads on the gun. Pietta sells complete screw sets so if you do.
Here's a 3 piece set of Grace Screw Drivers for the Colt Peacemaker on ebay that is perfect for these revolvers:
https://www.ebay.com/itm/272046884581