You may have heard of three-point lighting; a guideline to follow or ignore as you choose. I will sketch it out for you here.
Light #1: Key light. This is typically at a 45-degree angle from the direction the subject is looking and is your brightest light.
Light #2: Fill Light. This light shines from the other side, possibly also 45- degree angle off-center, and fills in the shadows made by the key light. It is softer and dimmer than the key.
Light #3: Back Light. This light shines down from the rear softly on the back of the subject to separate them from the background. Light #3 could also shine on the background for the same purpose.
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