Hello there, ive been watching alot of transit maps, and especially. after seeing this:

You Won't Believe How Insanely Detailed This Guy's Fictional Maps Are. Seriously. - Wired Science

And a look at the metro maps, this guy has created, i thought. I really would like to make something similar to this.

What i would like is. some tips and some precise and concrete examples on how to make maps like this. Programs like inkscape and illustrator i know you need. No worries. Though i would like maybe some helps on what tools to use. Where to start. and such.

Title explaination: I thought. Many must have asked this before.

Thanks in advance.