Now, have you created your character and world? Yes? Good. Now, look around, see those tree-looking things? Use the WASD keys to move around. Now, go to the trees, and use either your number keys or your mouse scrolls to go to the axe thing in your hotbar. Ok? Now, with your mouse click and hold at the bottom of the tree, in between the triangle things on one or each side of the tree. Keep holding until the tree bursts into little things that look like planks of wood. Go up to them and pick them up. Do this process until you see the number 100 under the planks in your hotbar.