Running N' Gunning - The title says it all you've gotten learn to run and gun. A few drills i recommend using are...
Run Through Drill - Set up a target course that you run through shooting targets at certain points.
Jousting Drill - Where two players try to reach a mirror bunker but try to eliminate each other before reaching that bunker.
4 Corners - A two player drill each player starts off on their right or left hand side both the same just on opposite sides of the field. Each player runs down the side shooting at the other player not stopping until they've reached the other side.
Every skill will help you as a player those are just a few key skills and how to improve them. I really recommend Dynasty Dysected, they walk you through everything paintball. Hope this post helps good luck and have fun.
"The challenge is what we live for... "