I may have posted this in another threat that was similar but if it helps anyone I think it's worth a look: https://www.youtube.com/watch?v=XS1w8vldA0w
Kind of gives you a bit of an overview of how you might use this in the simplest way possible - setting up flat shade rooms just so that the lighting and proportions are 100% set, then you just export it as a jpg image and paint right on top of it.
This is a good reminder to actually jump back into it because I got some basics down and then just fell out of the habit