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If it's procedural generation of the dungeon what you're interested in, this tutorial might come in handy. Part 3, in particular, shows you how to create a basic dungeon generator that will produce something similar to this tool. Alternatively, I have some code here, made in Processing. I said I'm just starting out,  but this goes a long way. Thanks!

So quick question: what is Processing?

It's a programming environment with an unfortunate name, hehe. It makes googling a pain. It's very easy to draw stuff, you can find it here: The dungeon generation algorithm doesn't really require it though, it should possible to follow in whatever language you're using.

(1 edit) is a good place to start...