Need a Price Estimate

I’ve been asked to do a full redesign for one my city’s biggest Auto wholesalers.

Besides a clean, sharp, fresh design, he needs an HTML front-end for his daughter to use; this Summer, she’s going to be using the HTML-driven database editor to add and remove vehicles (with pictures, and information) from the online database.

Two questions:

1) What should I go with to make to backoffice? PHP? ASP? MYSQL? I’ve had one year of college-level C++ and other minor programming experience, so I’m going to need to learn a bit.

2) What should I charge for the design + backoffice? My designs can easily hang with the best non-flash web development businesses.