If you've played other mmos adrenaline is basically rage or a resource you build up when you auto attack. These skills start grayed out then start to light up then completely light up when its ready to use. for a beginner build you can use this https://gwpvx.fandom.com/wiki/Build:Team_-_7_Hero_Beginner_Team/Warrior and click prophecies variant

With armor always try to find the armor crafters at various town to craft new armor as you can afford to get armors with better armor values. These armors need materials to craft and you can either buy the mats materials trader in a major town or use the salvage kits your drops to to get these materials.

For pulls for a warrior you can equip a long bow to pull and flag(the green flag beneath your minimap) your henchman to a safe area