First of all tele to skills via magebook and buy your axe there. Once you have bought your axe go to the right of the shop and start woodcutting there. Start by wcing tree lvl 1 - 30. Willow lvl 30 - 60. Yew lvl 60 - 75 and magic logs lvl 75 - 99.
Hope you like the guide Smile
have fun - Pkguykill