Seems like you might have Friend/Mentor but that's not essential.
So just fill the pan- if you have some type of Pan charger. (the ones with the spring type "spout' usually dispense about 3 grains or so if they are clean and working right)
I really like a small "Priming horn" and use 4f powder FOR THE PAN ONLY NOT LOADING THE GUN!!
I don't want to worry you, but if you get a Charger that's Brass (with a screw on spring tip) I would like you to drill a small 1/8 hole thru the back of the body (right thru the Knob that you use to put a string thru, and plug it with a small wood Stick or some silicone glue.
WHY
Im glad you asked. IF--- The pan Charger/Primer ever gets a spark and ignite's there is no place for the pressure to go and you'll loose some body parts most likely your hand.
SO if you have the hole the glue/plug will relive Pressure, and you will mostly will just have a exciting experience and not a Tragedy.
Have Fun
Muzzleloading Guns really aren't Dangerous just be deliberate and thoughtful you'll be fine