New bowling ball don’t have any holes in the ball so you need to go to a bowling shop to get holes drilled to fit your hand. If you are using a used bowling ball, then then you need to take that bowling ball to the shop to get plugged. Getting the bowling ball plugged means that the ball holes will be filled and sealed so the shop can drill to fit your hand. It does not matter how small your hands are and it does not matter how big your hands are, you can have a bowling ball that will fit your hand.