What is the legal procedure to settle unpaid invoice? -

I have supplied item(s) to one of my customer and he is not paying the bill and i would like to know what are all the details should I have to take legal action against the customer? And what is the procedure for taking legal action against the customer?

It starts with sending a legal notice to this customer (through your lawyer) and asking him to reply within 1 week. In case of non-reply, your next step is to approach the consumer court.