You can use those coins to buy different upgrades for your cue. From there, you need to try and beat your opponent by following the corresponding rules - hit the striped or solid balls. Use your finger to aim the cue, and swipe it forward to hit the ball in the direction that you want.
Gameplay in 8 Ball Pool is very similar to any other pool game.
8 Ball Pool is a pool game for Android that allows you to play against people from all over the world in turn-based online games to find out who the best player is.