But don't be in such a rush, but at the beginning if you understand the game, leveling with adventures is pretty easy, but pay attention to all aspects not just what level you are. There are plenty if people who have what looks like a mid level and are weak as a baby.
Yeah, the game is all about balance... If you become too high level but you're weak, you'll get trounced as soon as you join war mode... Not as much of a big deal if you stay off the radar and don't do war mode. If you are strong, but stay a low level, you wont be able to open up any cool bosses... :-/
IF YOU WANT TO LEVEL FAST ITS NOT THAT HARD AFTER YOU AND A LEVEL PARTNER GET YOUR STATS RIGHT BUT!!!!!!!! LEVEL FAST YOU WILL BE WEAK (DEPENDS ON HOW FAST YOU WANT TO ACTUALLY LEVEL) AND BESIDES ALL THE FUN IS WHEN YOU ARE LOWER LEVEL