All very good advice and I learnt some new stuff too

I focused on the best path of leveling for a new player, but definitely do the Novice Missions at Lv 15, because this gear will be your BiS for around 5-10 levels - especially useful because this is when your first dungeons happen.

Never played tank, new player of three weeks myself. Tank is the least played role it seems and very needed. From what I saw a good tank should know the dungeons down to what to pull (Aurum Vale at lv 48 is the first dungeon that really punishes "pulling everything" lol...), should know how to mitigate incoming damage at the right time and how to keep aggro off his squishy companions (even when they got a pesky overhealing WHM in their group ;D).

Just in case some of the terms from before were confusing (was on the mobile phone):

Hunting Log
FATE - at later levels those will cap at EXP and start being useless.
Duty Roulette - my "secret" to quick levelling I suppose. Had only one bad experience with randoms so far. Can also be run with guildies and friends (pre-made party).
Challenge Log - will run at the same time with FATEs and dungeon roulette etc. You pretty much only need to unlock it once and play the game. Feel free to scroll through the tasks though, some are a bit more specific.
Leve