Sam,
I'm sure there are some good references on mixing available online, and I'm also sure that others on this forum could do a better job of answering that question for you than I can.
But, do this. Think of a large room. If the drums are up close to you, you're going to hear them 'directly,' but if you were to move them back a bit, you would hear them, and you would also hear the reverb from them as the room contributed to reflecting the sound back to you. So, you can add the reverb effect and it'll seem to move the drums backwards a bit from you. You can also lower the volume of the drum track slightly to help that illusion. But, in the long run, remember, you are listening through only two speakers for a stereo track, and there is no depth perception. So, you have to 'fake it.'

If anyone disagrees with me, or can explain this better, I'd like to hear it, please.

Gary

I'm blessed watching God do what He does best. I've had a few rough years, and I'm still not back to where I want to be, but I'm on the way and things are looking far better now than what they were!