It really depends what you want to achieve, Shin. I've been playing a monk for a while, just hit sixth level, and here's what I can tell you:
1) The Wisdom bonus to AC comes nowhere near making up for the armor prohibition. Don't try to make a primary combatant-my guy can deal a lot of damage, but he sucks up a lot too, and doesn't have near enough hit points.
2) If you do expect to fight a lot anyway, the Tumble skill and the Mobility and Expertise feats are your friends. Don't stand around letting things beat on you-dart in and out taking good opportunities to deal some damage while minimizing risk to yourself. Spring Attack is probably good, too-I just picked up the feat, so I can't say for sure.
3) If you get stuck in melee, flurry, flurry, flurry! The times when it's better not to use Flurry of Blows when you get a full attack are so massively rare that it's best not to think about it.
4) Your good saves, special abilities, and speed make you a natural mage-killer. SOP for PC and NPC groups alike is to put some grunts up front dealing melee damage while a Wizard or Sorcerer cowers in back tossing devastating spells. When the Monk tumbles past/through those front lines and hits the mage with a Stunning Fist ... well, suffice to say that mages have poor Armor Classes and Fortitude saves. You do the math.
5) Likewise, the saves and abilities, including the pretty decent combat skill, make a Monk a good scout. Move Silently and Listen, and (I wish I'd done this) some cross-class Spot points help here. (Alertness feat too-I
did do that, and have never regretted it. Sucks to be flat-footed when you have no armor ...) If something does jump you before you see it, your combat skills and saves make it likely that you'll be able to get away and warn your party, and your high movement rate makes it likely that the warning will get there before the beastie does.
6) Speaking of the Alertness suggestion above, Improved Initiative is a good feat I wish I'd taken. Maybe at 9th level ...
Just a few thoughts from the trenches ...