It will be an outdoor range.
Well, then you'll want the firing line(s) to face north, if at all possible. For obvious reasons.
Section II (the grey tabs) in the
Range Source Book covers outdoor ranges.
Please note that the position of the NRA Range Technical Team Advisory group is that each range is an individual situation with specific, unique locational issues. The Source Book will serve as you guide, but it is not a standard which must be followed by all ranges.
The SB has a zillion excellent ideas. Section IV (red tabs) contains the architectural and civil engineering drawings.
A Google Map view will tell you what's downrange for the next few miles.
I thought it might be fun to see if anyone had some "hands on" experience or ideas first.
Responses to that issue will pretty much all depend on your intended usage for the range.
Best of success to you in your planning. Here's hoping you have 2-300 yards of downslope so that you can shoot over the creek and into the hillside.