First of all, you should use the new Revit PBR Material Shaders (not the Legacy ones, which have a yellow triangle at the bottom left corner). So, when you create a new material, go to the "Appearence tab", click on "Replace this asset" and choose a base material under the "Appearence Library > Miscellaneous > Base Materials", based on the shader you want (under the "Type Column", you have the following options: Layered, Transparent, Metal, Opaque or Glazing)
Currently, I think Enscape do not support Layered materials (maybe someone can confirm)
Depending on the shader you chose, you will have the following options:
Image: this is the place for your albedo/diffuse map (the colored one);
Reflectance: if you have the reflectance map, you can use it here (I am not sure if it is supported by Enscape, I think it isn't)
Roughness: here you can use your roughness or glossines map (if you use a glossiness image, make sure you check the "Invert Image" checkbox)
Relief Pattern: you can use either a bump or normal map (make sure to choose
Cutout: A cutout map determines, with black and white, what parts are visible and what parts are removed
Advanced Highlight Controls: anisotropy map (but this is not supported by Enscape as for now)
Ambient Occlusion (AO) is not supported by Revit, ergo you should not use it. The AO map contains a distance-triggered shadow. What you can do, actually, if you need a deeper relief, is to place both your albedo and AO maps on photoshop (on separate layers) and make the AO a "multiply" layer with reduced opacity (something between 5~20%)
What we do here, is to create like a showroom of materials (see attachment), so they can easily be imported to any project you have. Also, when you are testing your materials, make sure you test them on a real project (so you can make them as realistic as possible).
This is the workflow we have here at our construction company, I hope it helps you somehow (because it took me a lot of time to test this, I know how hard it can be at start)
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Websites for textures:
(free) https://cc0textures.com/
(free) https://www.sharetextures.com/
(free) https://www.texturecan.com/
(paid) https://www.textures.com/
(paid) https://www.poliigon.com/search?type=texture
Explaining to revit materials: http://wiki.bk.tudelft.nl/toi-pedia/Advanced_Materials