The best way to start drawing hands and feet is to draw it by nature with chalk/pencil (i prefer chalk for starters 'cos it makes you concentrate more on the structure then on details). You may start by laying your left hand (or right if you are lefty) on solid surface and the draw. You could do the same with your feet. If you need to change an angle, you can do that with mirrors. Believe me, my first drawings of hands i made like this, and i learned a lot from it. You can also find someone to pose for you, the best models are old people- on them you have everything- you can see bone structure, muscles and skin has much les water so it’s wrinkled and thinner. If i was you, i wouldn’t even try to learn from books- that way you can improve your cnowledge of anatomy, but you can’t learn to draw good. Exeptions are old masters - and in my humble opinion, the best anatomy studies were made by Leonardo and Michaelangelo. The others i don’t prefer, 'cos they all learned from them.