How do I shade 3D text?

Hello!  I'm so very sorry but you have a self taught newbie here.  So, I'm not sure the correct verbiage to use, hopefully my explanation will be clear enough.  I've included a screenshot.  While not exactly what I want to do - I believe it's close enough to help me get me there.

So, I'm making a 3d text.  I can extrude and bevel and all that and it looks great.  

But here's what I really want to do.  I want the original text before extruding to be one color.  Then I want the extruded part to be another color.  I found one tutorial but they use both Photoshop and Illustrator to accomplish this.

Do I really need Photoshop too?  Any tutorials you can point me to would be seriously appreciated.

Thank you!!