Welcome, Annika !
We'll take even improvised digital photos of your work - I don't want to wait til you scare up a scanner :-).

If you want to do digital work similar to your past maps, even a glimpse of what you've done will give us a clue as to what to suggest for tools. Arsheesh is quite right - The Gimp and Photoshop are excellent general-purpose apps, with which you could accomplish about anything. If you are drawn :-) toward vector styles, Inkscape would be a good pick, and it is also free.