[WingedPanther]

A google search for Delphi tutorials returned numerous useful results.
If your IT Dictionary is going to be static, you can use many different ways to store it, including a database. If it will be dynamic, you will need either a database or a file to store it on.
Making and interacting with a database depends a little bit on the type of database you use, but a TQuery is the standard object for interacting with it. You will need to learn SQL to work with the data. The database you choose doesn't really matter, since you aren't doing anything that is likely to be sensitive to issues like scaling well.

I would recommend that you stop worrying about the database for a moment, and start worrying about what, from a user's perspective, the program has to accomplish. If this is an assignment where you HAVE to use certain technologies, then figure out what that technology has to do with providing the functionality. For example, don't buy an Oracle license for $2000 dollars, if a text file will do the job. After you determine what needs to be done, and what techniques/technologies you need to do the job, you can ask questions like "which database should I use?"