To groom a horse, you need a few essential things.
Curry Comb -Using this, you brush in circles.
Brush- Start at the head/neck and work your way down. Using a Flicking motion.
Hoof Pick - Pinch the back of the horses leg, and pick it up. Work around the "V" Formation (Frog) in the horses hoof and work outwards.
Mane & Tail comb -Start at the bottom to get knots out and work your way up.