Hi, I'm currently working on a web application in my internship project.
By that I assume you know something about how to build a web page.
So start by building 2 web pages, one that the user will use to enter data and one that will be returned filled in with a typical example of the database information.
Then read up on PHP. It's a relatively simple task, once you have those 2 pages designed, to get them to interact with a PHP database. (or ASP if you are on a Micro$ server - the database here is a little more tricky)