How do I make Wizards of the Coast dungeon style map?

[Saruva]

Hello guys (girls), I know that WotC doesn't make the maps, but their maps are kind of a reference, so, I never did something so fancy before like these dungeon map (see below) I mostly use some simple mapping style to do my dungeons but I have this awesome dungeon in my mind that needs to come alive in a good map but I don't know where to start!! Here are my questions regarding the example maps:

1) Does this style of map have a name? (I can see that it's drawn but I can't find tutorials for it)
2) Are there any tutorials about this style here? If not, where can I find tutorials for this?

I see that they're hard and trick to do since it's drawn, any ohter information about how I can make maps like these will be very appreciated. Thanks in advance!