You really don't have to study any leveling dungeons or other instances beforehand, they're simple enough that you can figure out the mechanics when you see the fight. It's not commonly expected for first timers to know what to do beforehand until very late endgame at level 60. If you want to, when you enter an instance for the first time, you can type in party chat that you're new and would appreciate if your party members would tip you about any mechanics that might instantly kill you or make you wipe your party. Remember leveling dungeons and instances are meant for practice.