The best way to learn how to draw hands is first get a sketch book. then lay your left hand on the left side and then practice drawing/sketching your own hand. try to draw your left hand in different poses. opened closed fingars out, fingars in, try different angles and signs, ect...
to make a right hand just draw everything in reverse. Also when sketching with a pencil its best to use your right hand and to draw from the left side to the right top to bottom, this way you don't get pencil all over your palm. Or smudge.