I have a three rocker switch and one white, two black, and one red wire coming out of the box. How do I connect these four wires to the switch?

No way to tell. You need to know how it was roughed-in or wired previously.

What other wires are in this box?
Where do they go?

What's a three rocker switch? Do you mean a 3-way rocker type switch? If so, there should be another 3-way switch. You will have to tell us how it is wired for us to tell you how to wire this one.

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one white, two black, and one red wire coming out of the box

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Not logical, if you have two black you should have two white.