I have this makita drill, this is my first drill ever I am a bit confused.?

Set the foward/reverse on to forward, grasp the chuck and press the trigger. This should bring the jaws out of the chuck to the max! If not, something`s wrong. You probably have a refurbished tool. Try working the chuck in a alternating forward and reverse manner while holding the chuck, This may free up the jaws if they`re stuck( a little wd40 will also help) If this does`nt work I`d return it!