The Bass and Snare go down the center, typically speaking. The cymbals are recorded by drum overhead mics, and this will create a stereo image of the entire set. The overheads are then typically panned hard left and hard right. If u elect to close mic the toms, then the panning will go from left to right or vice versa depending on the perspective of the drummer. Meaning u could be the drummer perspective (left to right) where the drummer hi-hat is left and etc etc etc. Or u could be the audience perspective (right to left) if the drummer is right handed. Oh if u add hi-hat or ride mic then just think about where u place them by looking at the positioning of the set in retrospect to the Overhead panning. And yes when u mix down you create a stereo file.... if u want u can have a mono rendering. But no-one wants that.

thanks man god bless you.