Creating a page to update content

[c.mike]

Im creating an auto dealer website. I am trying to add to my inventory using a basic page where I can enter new data and upload images. This page would then have a button/function that when clicked it would update my site with a new entry. It would be similar to ebay's method but with just one single page for inputing information.

I would also like to be able to edit this site when it is published by means of a user login.

I am using Frontpage but I also have other programs that I could use as well. What is the best to way acomplish this?