ok so first ur going to click the Woodcutting Skill Tab. and talk to the woodcutting tutor for your very own Axe u dont have to weild to use. and u will start off here
cut the normals and oaks to the level you want i traied there most of my wc lvls but there are diffrent areas and places with diffrent trees like.
This is just a quick run North but if your looking for willows. here is a simple way to get it first click on your Prayer Tab.
go north and around ozich
go to edgevill and you will get a few willows like i said i trained 99 at the normal woodcutting tab zone but u can use these trees for fletching for firemaking :3