RE: shooting for the first time nedd help
The big thing is read your manual until you fully understand the workings of the rifle. Also make sure you have cleaned the rifle as best as possible before you start. Lube the breech plug with a good quality breech plug grease such as CVA - Slick Nipple and Breech Plug Grease.
The rest is just working up a load for your rifle. 100 grains of all powders but Triple Se7en looseis usually a good starting point for most projectiles. Then when you seat the projectile make sure you reach a witness mark. Swab between shots and again, watch that witness mark when you load.
The rest is all fun.