I'd suggest you do an extremely careful business plan before you put any money into this.
The shooting world is just not ready for non-lead ammo quite yet (with a very few highly specific exceptions like SIG Academy), so you're going to be dealing with major OSHA and EPA issues about lead. Personal protection against lead contamination and the containment and disposal of lead is such a huge headache that everything that has lead involved somehow is far more expensive now than 10 or 20 years ago. And these are getting stricter and more costly every year.
Make darned sure you know what it will take to cover the costs of handling the issues in accordance with the law. You cannot possibly afford the penalties for screwing up.
(I'm in the construction industry. For a small firm doing house remodeling, not properly containing and disposing of materials which MIGHT contain lead paint could cost us up to $65,000 PER DAY we're found in violation. And that's just EPA fines for contaminating a home. Add to that whatever OSHA would fine for not properly protecting the employees!)
Serious business. Costly business. $5 per hour to shoot or whatever is hardly going to cover it.