Powder- You have it covered, Loose or pellet form. If using pellet form, you don't need the next two things. You shouldn't mix the two types of powder(loose/pellet)
Powder measure- Needed in one form or another to measure loose powder. There are some that are just the adjustable tube, and some have a funnel on the end to make it easy to pour down the barrel. Brass or Plastic, take your pick
Powder Flask- Used just like the alcohol one, to hold a smaller quantity while out shooting or hunting. It also makes it easy to pour the powder into the powder measure, as well as adding a bit of safety rather than pouring straight from the 1lb. container with a funnel on it.
Short Starter/Bullet Starter- Needed to start the bullet or sabot down the barrel straight, as well as making it easier than trying to fumble with the ramrod as a starter
Bullets- Sabots-(can be bought already pre-packaged, or you can buy the sabots separate from the bullets and save some money)
Round balls- which are usually good for light loads in a fast twist as the huntsman, but try them to see what works for you, just be sure to use a patch(I like pillow ticking lubed with bore butter for my hawkens rifle)
Conical bullet- Maxi-ball/hunter, Great plains bullet, PR bullets, etc....just lube, stuff, and shoot
Primers- The breech plug uses the orange carriers using 209 primers to ignite. Some of the primers are pretty hot, hence the reason they are coming out with lower powered ones to cut down on the Triple 7 "crud ring" that you get after a few shots. Not a problem for you since you are going to try pyrodex. You can also spend about 60ish dollars on a .25acp breach plug if you want, look on the prbullets website for info.
Possibles bag- Used to hold all your goodies, when going to the range or the woods. I just use an old green surplus shoulder bag
---Use dish soap, and REALLY hot water to clean at the end of the day. Lube your breach plug good, and loosen it after a few shots so that it is easier to take out when ready to clean. Sourdough turned me onto using windex as a cleaner instead of water and soap...works just as good. This is going to turn into a hobby like reloading, you thing that you are going to use the minimum and get by, but you slowly accumulate more "stuff" as you go along. Plus you can use it for gun and muzzleloader season in Ohio. I use around 85 gr. pyrodex/ or Triple 7 with a saboted 250ish grain bullet the majority of the time. Definately cheaper than 12-15 dollars a box of 5 slugs....Good luck Stimpy, and if you have any other questions, just ask.
--Amos