How to apply physics on multiple sphere after collide like in Snooker game in unity?

I'm new in unity developement. I want to develop android game application Kanche(Marble). It's marble based game. Player need to take out other marbles from circle.

What I've tried so far is, Rall a ball in unity. Then I've added marble sphere in it. When player sphere and marble spere collide with each other, player sphere just push the marble sphere and both sphere moves in single direction, it's not giving similar effect as Snooker game. I've also searched for templates for Snooker base unity project.

What I'm seeking for is,

1. Logic for collide of two spheres and after movements based on physics.

2. Any document, guide line, tutorials, sample source code to understand the concept of collides, physics etc which is similar in Snooker game.

3. Or any other solution like should I use 3D models or something else, to develop above application if I've started in wrong direction in order to meet requirements.