Lumberjacking is used to harvest logs and oak logs (at 85 skill or higher) from trees. Lumberjacking also grants a bonus to weapon damage dealt with 2handed axes.
Formula for axe damage bonus: ((Lumberjacking Skill / 10 ) -2) + (1 if GM)
50 skill (+3), 99.9 skill (+8), GM (+9)

Raising Lumberjacking: Lumberjacking is a resource gathering skill. Double click an axe and target a tree for a chance to harvest wood. Do this repeatedly until you reach 100 skill.

Gideon's Advice: Lumberjacking is very boring but very profitable. I would highly recommend you run two accounts and do something on the other one while lumberjacking. However, do not lumberjack AFK as it triggers the AFK gump and you'll be jailed. I placed a house in a forest with low to no spawn and simply ran a macro on Razor to chop last target and say 'Next Tree' when the tree was out of wood and figured out an efficient pattern so trees were respawning by the time I came back to them. This skill takes a significant amount of time to GM. I would recommend sparring with a hatchet to reach 65 skill quickly. At that point you'll need to harvest wood to gain skill. Lumberjacking gives a monstrous bonus to axe damage so I would suggest turning this character into a Pure Dexxer. Do not make them a crafter as it's a waste of the combat bonus.