[LastManOut]

First you may want to check your township zoning ordinance for noise, etc. with regards to the shooting range. With that said, the set-up I have on my property has a 10 foot drop in 350 feet. My range is a leveled off swath 10 foot wide with the 45 degree berm as a backstop.
A pile of dirt high and wide enough should work well, add a bit of landscaping around it and a good shooting position or two. I am putting red gravel down at 3-7 yards and 25 yards to recover the brass and a shed/bench rest at the farthest point. Try to align the range in a north to south direction to avoid the early/late sun.
There are some good safety tips on the web for building a range. I bought the NRA range book on CD which has beau coup info on personal and commercial ranges.