Things the owner will (or at least should) do before spending a dime:
Get in touch with his local and state government. His property may not be zoned for manufacturing, and there may also be prohibitions on how much powder he can store, or if can even make ammunition.
Call his insurance agent. Liability insurance may make this endeavor cost more than it will return. It will also effect the cost of his fire insurance.
Check with the EPA. While home reloaders are immune, the EPA may have requirements due to the amount of lead he will be using/handling.
If he clears these hurtles, he then needs to procure a FFL license to manufacture ammunition for sale. While the license is only $30, getting it can take several months.
At a bare minimum, he will need a Dillon 1050, and an automation system for it, unless he plans on paying someone to pull the handle for him. Figure around $2500 to $3000. If he's really serious, Camdex (located about 20 miles from me) machines, which are capable of over 4,000 rounds an hour, start out around $12,000 and work up from there.