First suggestion from me would always be read the manualfolowed bya complete takedown for a thorough cleaning. I can see nothing in particular wrong with your choice of components (other than expense). To cut down on expense, you might want to try loose powder along with some Hornady XTPs or Speer Gold Dots of appropriate size, then matched to a properly fitting sabot. By the bullets and sabots in bulk and enjoy a lot more shooting for a lot less money. Winchester 209 primers should be plenty.

Cayugad has a list of items a beginner should pick up - you might want to locate that list here on the forum.

Take your time and enjoy the sport!