Test a lot with your camera.
Whatever lights you're going to use go ahead and bring it/those to the set you're likely to use with a dark coat on the back of a chair and a notebook.
Set up camera, coat on chair, and lights.
Put your camera where you want it depending upon your aperture and focal range.
Shoot 20 seconds of the coat with your light beside your camera aimed at it.
Move the light back four feet, shoot another 20 seconds.
Move the light back another four feet, shoot another 20 seconds.
Put the light back beside the camera and aim it at the ceiling, shoot 20 seconds.
Move the light back four feet, shoot another 20 seconds.
Move the light back another four feet, shoot another 20 seconds.
And you're writing all this down in your notebook unless you just happen to have some super Mentat (Dune) memory. I don't. I got better things to clutter up my head with.
Now, start thinking "What is it I gotta do to get this light right where I need it"?
Do you need more or less?
Do you need different lights?
Would a string of Christmas tree lights be better?
How about a flashlight?
Do you need a key or halo light?
"F#ckit. What I really need to do is change the setting, 'cause this sh!t ain't working".
And this is all gonna/likely look different on your computer than it does with your own eyeballs because (hopefully) the camera isn't anywhere near as good as what God gave you.
Look for grain caused by gain.
See what you can do with tinkering with lightness/balance/gamma levels.
If it still looks FUBAR slap it up on yoobtube and see if anyone here has any bright ideers.
GL