Nice map! I can't help with choosing inks, papers, etc. and the style works very well. Your lettering is so well done, very impressed. One thing I noticed is your hatching could be tighter. By this I don't mean spacing but just ending on the edge line, working to get slightly straighter, consistent spacing, etc. And this is only for improvement, I think it looks good the way it is. But I know you want to spend even more time drawing tiny little perfect lines.