How do I install a 3-wire(Red,Black,White,Ground) wires for a ceiling fan in the ceiling?

I am installing a ceiling fan for my master bedroom. Problem is: I have one light switch and the fan is a fan/light combo. Hence the electrical problem. There is no Red wire in the ceiling coming out of the box. Only black, white and ground. As of today, I have installed the ceiling fan because an... show more I am installing a ceiling fan for my master bedroom. Problem is: I have one light switch and the fan is a fan/light combo. Hence the electrical problem.

There is no Red wire in the ceiling coming out of the box. Only black, white and ground.

As of today, I have installed the ceiling fan because an employee of Lowes said it was fine to attach the black and blue on one line. Unfortunately, this turns the fan and lights on at comparable levels. (i.e. fan on low, lights dim. Fan on high, lights bright.) I was wondering how to install a wire/switch that would contain a 3-wire combo instead of my existing 2-wire?
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