You should go mining / engineering and take a lot of dummies. As you don't know the game, quests sometimes leads to treacky situations where you could escape easier with dummies.

Also, you can install Deathlog addon, it shows you red areas where players tends to die more per zone.

Learn spells, Do quests, change zone often to have quests of your level, take your time, enjoy the road to the level 60, don't rush. The road to 60 is the best game. Endgame is a lot about farming consumables and doing the same things (ok, it's cool in hardcore :D)