You're gonna want to have a look into actual wood, then decide what quality of wood. For example, if you want low-quality, untreated wood, you'll want about 3 different shades of wood, medium, dark and light.
Dark basecoat, wash with a medium brown like Agrax, paint over the panels with medium, avoiding recesses and lines, then a few highlights of light.
For heavier, treated wood, you'll want to go darker, dark brown basecoat, medium layer, then the wash with a fleshy colours
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