I don't mean to be a downer but there's a whole lot involved with building a 1000 yard range all of which adds up to some serious costs. Everything from legal advice to potential platt approvals to public comments, and then there is the construction (baffling and backdrops and shooting stations, etc) followed by the technical stuff (targets, shooting platforms, etc). I watched this take place at a range which opened nearby.
Here's a suggestion which might save some $$$. Contact the NRA and see if you can obtain some freebie advice on what's involved for a private range including legal issues, etc.
Best of luck.