I'm glad you installed the demo. (I had to ask.

)
I think this will work fine for what you want to do. Eventually, you'll probably want to adapt the short/long modification that is available at
http://www.jpdeni.com/dbman/short.txt
First, though, you'll want to set up your own fields. Go into the default.cfg file and, following the patterns of the fields that are there, enter your own field definitions.
The reason I asked if you were going to be the only one adding data is that, if you're not, you will probably want to add a UserID field so that only the user who added the record can modify or delete it. You will also need to edit the $auth_user_field variable (almost at the bottom of the file) to match the field number of the UserID field.
If you are going to be the only one adding records, then you don't have to worry about a field like that. But you will need to set the $auth_user_field variable to -1. Otherwise you will have real problems.
Try adding your own fields and setting the $db_auto_generate variable to 1. Then check out to make sure your fields work. You won't see your graphics yet, but it's important that your fields are defined correctly before you start working on anything else.
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JPD