Contact bitmain directly , you going to get some discount on 1000 miners for sure
You need to build a complete farm for your 1000 miners , i mean buildings , and all the electrical requirements, air filtering , air cooling, security , fiber optic internet ...
You going to need a person on site with knowledge about mining , network troubleshooting , pdu trouble shooting .
If you have that money , all this can not be a problem for you !
Or ... Find a hosting company , who can host 1000 miners for you , this way you dont have to invest into a building ...ect
Make sure you know your local tax requirement about mining income , import taxes ..
You need to find a place , country with low electricity rate .
Im not sure what country are you from.
If you decide to go into this business , and you need a person you can trust , and you going to pay the right amount of money for your future employee , i would be happy to work for you
Bitcoin is the future , but is still a risky business