What you need :
1 red brick
A smooth surface to putt on if you don’t have a smooth carpet buy a 8 foot runner that you would see at a business.
A red brick on it’s side is twice as wide as a golf hole setting upright it is the exact width of a golf hole and facing the edge it is half the width of a golf hole. Start by putting at the widest side from about 5 feet away and work on hitting easy with a short rebound off the brick. Then slowly start hitting it harder to get a bigger rebound. As you get better start using a narrower side of the brick doing the same drills. When you are able to hit the edge of the brick with a long rebound you should be able to putt pretty well.