so i have a design like this till now:
CARS : license_plate_num (PK), car_type, req_driving_license, price_per_day
DRIVERS : driver_id (PK), driving_license_class, price_per_day, id_number (FK)
CON.DETAILS : id_number (PK), cell_phone_private, cell_phone_work, landline_phone_home...