Adding JHotelreservation component features

Hello, I need to add some features to JHotelreservation component : - Taxes to be applied based on children's age (actually it just calculate one taxe for all days booked an without comparing if it's adult or children) - To be able to print the reservation adding a print button on the opened window and placing data as I want to print well on a letter - In the report menu, I need to calculate for everyday the amount of paid rooms and the calculation of taxes (for rooms + extras) and the total thanks