Im telling in this page how to make the basic and important things to make in minecraft. It is smart to get 12 blocks of wood in the beginning. Remember where you spawned.
This is a tree, hold the left button on a wooden block and it would break after a few seconds. This is how you make wooden planks. Press i, and you will see this. drag youre wooden block(s) to that 2×2 square. Left click the whole time on the wooden planks till your wooden blocks run out. You cant do anything with a wooden block except as building material.
This is how to make wooden planks. You will lose your wooden block cause the wooden block turns into a wooden plank.
This is some stone, if you mine it you would get cobblestone. Now you need to make a workbench.