Copying tracks

I made mention below of the fact that you can copy your mono tracks and pan them left and right to create more stereo spacing - here's a basic scenario that works for both that idea, and actual stereo recording (again, as below).

track 1 - guitar - centre
track 2 - main vocal - centre
tracks 3 and 4 - second guitar - pan far right and far left
tracks 5 and 6 - harmonica - pan 50% left and right.

Using the EQ and mixing ideas already mentioned such a basic mix will give you a nice clear and wide stereo sound.