If you stuck underneath the swing plane on the downswing and slap hooking the ball practice getting your palm down and swinging it around your waist as if you were throwing a discus.
There are four common reasons for why golfers hook the ball, find out which one applies to you and how to fix it
Make a rehearsal swing behind the ball; take your grip and then step in with your right foot and bow into the ball with your hips. For a one plane swing it is imperative that you are bent over sufficiently at the hips.