Being a Bowman makes you able to do high damage due to Critical Shot (CS) in maple story. When Critical Shot is maxed, it adds an extra 100% damage at a 40% success rate. However, Bowmen have very unstable damage in lower levels until they max Bow Mastery / Crossbow Mastery (a 2nd job skill) or leave it at level 19. After it is maxed, Bowmen will become much more stable.
Bowmen can kill mobs with a second job advancement skill called Arrow Bomb (for Hunters) or Iron Arrow when your characters are bowmen in maple story. (for Crossbowmen) And how to become into a browman? Once you have reached level 10 in the game, exit Maple Island by going to Southperry and asking Shanks to go to Victoria Island for 150 mesos. You will then be teleported to Lith Harbor.
When you arrive, go down from the boat and find the Ticket Booth to the right of the maple story¡¯s boat. Double-click the NPC behind the booth and select to go to Henesys for 80 maple story mesos. (This would be the 90% Beginner's discount) At Henesys, go to Mushroom park and go right until you see a house, and enter it. Talk to Athena Pierce (Known as Helena on versions other than MapleGlobal) and she will instruct you on how to become a bowman. This is where your journey begins in maple story.
You have just become a Bowman. You'll need to work hard to level up to be the best that you can. Crossbowmen utilize the same build except that you need strength EQUAL to your level after level 30 maple story characters.