Car Hire software + a seperate CMS website

This website needs to be VERY SECURE!!! The Car and van hire software needs to be built which will be use only by the staff, admin and management team. I want the system to have all the standard functionality of a normal car and van hire software with the addition of the customized things i want added. i want to be able to add and remove cars from the software, and identify the cars by simply adding the car registration in, plus i want a srofile, so we can see all their details like, which car they rented, THEN I WANT A NICE WEBSITE BUILT. The website will be separate from the car hire software. Plus a separate website for the customer, i have a current website: [[login to view URL]][1] i want a developed.