you need to change the deployed airbags with brand new parts and then get a new ECU for the airbags, Honda is the only place that will sell you the new SRS-ECU unit and airbag modules. You will also need a few bits and pieces from the interior too.
Call a dealership showroom and ask them to give you a quote.
Its usually an insurance claim where I live. Airbag replacement cost can be very expensive as they are quite expensive to transport.