Can anyone tell me how to make bill..?

Right now I'm working on site of paver block how can I calculate cost and make bill if anyone knows plz guide me

piyush singh thakur, when you say "bill," are you asking about:
--How to estimate how much material you need?
--How to develop a cost estimate for all the work involved with constructing a paver block area?
--How to send an invoice to the owner so that you can get paid for a paver block installation that has been completed and you or the Contractor are trying to get paid?