Help with a client interface form

I am fairly new at web design and to date have only done pretty basic stuff. I have a client that owns a car dealership and would like to have the ability to upload their own photos and details of their cars through some type of form. What is the best way to do this? Each car would have a thumb nail on the main inventory page and then it's own detailed paged with mulitple photos, perferably in some type of slide show.

These come in a variety of languages, You could write a basic one easily enough but that would require investing some time in a language such as php.

Or you can take a look at some of these

Or just do a google for something like 'php image gallery script' or 'open source php image gallery script'