Characters vary widely in how they respond to light, depending on their skin materials. Which character are you using?
For beginners, I usually recommend placing a distant light in back, shining over the shoulder, to get a nice “rim” effect, then one on each side, and one from the front.
Start with about 25% brightness, and don’t use white. Use either a bluish-gray, a pinkish mauve, or a slight whitish yellow. Then shut each light off to test each one, increasing the brightness more on some than others so you get some nice shadows.
But again, it depends on what character you’re using. And your render settings, as mentioned before.