The first step is to send a legal notice to the defaulter within 30 days of receiving the cheque return memo.
If there is no payment from the defaulter then file a complaint under section 138 of The Negotiable Instruments Act.
However, the complaint should be registered in a magistrate court within a month of expiry of notice period.
Or you can file a separate suit for recovery of cheque amount and lost interest under order 37 of CrCP (1908). There are special courts that handle purely cheque bouncing cases where you may file a suit and it will be fast tracked. Dishonour of a negotiable instrument is one of the few crimes for which a party can receive both, a civil as well a criminal remedy. While the judge penalizes the other party under the criminal law, he will still acknowledge the money due to you/your company and refund the same.