I'm still fairly new to the site and mapping in general so I thought I'd throw a question out there for the experts. I'm currently working on a tabletop campaign that takes place in what I'm calling an Alternate Victorian-Era Britain where an unexplained cataclysm shook the foundations of the world and nearly wiped out the human race. So far I've sat down and drawn an overland map of the area the game will be mostly focused on.

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It came out well enough and I'm pretty pleased with the results. Now I want to focus on making a nice map of the main city in the campaign where the PCs will be spending most of their time -- Lorbridge. In my head it's pretty much a replica of Victorian London, albeit with a few variations here and there. I was wondering if anyone had any suggestions about how to go about creating such a map? I've been looking at tutorials on here but I can't quite make up my mind on how to approach things. Any help would be much obliged!