The link suggested above will be helpful.
Here is squashgame's link  from the Squash Library, on the Home Page, with a description of various squash balls.

For coaching, and for juniors who are just starting, a red dot or double red (referred to as constant temperature) might be the way to start off; not all clubs sell these balls.
If you are not getting any rallies and the ball is too dead it can spoil your game.
Then, I have seen players who can hit OK use the bouncy balls which might make a more exciting game because of the speed, however it can also be dangerous when hitting uncontrolled, and the ball bounces/rebounds into the middle of the court where two players can be sort of falling over each other trying to get at the ball, and get out of each others way.

Some clubs do have a policy, eg double yellow dot for the top grade comp; green dot for the middle grades; single yellow dot or blue for the lowest grade.  This depends where you hale from too, eg a hot climate, cold climate, airconditioned centre, winter, summer, etc.

Good luck with your squash.

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go to www.ithacasquash.com and read the articles about balls.

I would suggest the Pointfore blue and red dot balls to start with. When you can start hitting it so the ball crushes on the front wall and makes a 'crack' sound, move up to a Dunlop single yellow. The last step is the double yellow.

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