simple game spinner

Hi I am new to scripting and would appreciate any help or direction that is given. I am working on a spinner for a game im developing for my wifes birthday. I have a preliminary model of what it looks like, but I need help scripting the touch spin for the heart-spinner It is for her android phone. I already have colliders set up for it to land on I just do not know how to touch and spin the dial to have it slow down and land on a random category. If there are tutorials out there to help me through this it would be amazing to be pointed in the right direction. again thanks community for any help provided.