Hey there @Head69100! Welcome back to the community! So what you’re going to need to do is translate that map to what’s called a height map! Height maps are grayscale maps that show depth based on the value of each pixel.
They look a bit like this:
So with the map you have in front of you however it gets a bit harder than just translating it to grayscale and plugging it in. This is because there’s shading, and water lines, and outlines. So you’d first have to do a bit of a “paint over” and make this map a grayscale heightmap with no outlines… Then you can import it with one of the tutorial I list below!
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