While it's for DBPro, and not DBClassic, you might want to have a look at the DBPro Challenge thread.
In particular, half way down
this page where RiiDii offers up some tutorials for making a 2d rpg (from character creation, up to maze generation and baddie movement - you may need to read a page or two to find all his tutorials).
And also, there was a challenge to make ASCII Frogger in the
same thread - looking at some of the entries there ought to help you.
Good luck - I look forward to seeing what you come up with!