I am sure there are other resources but once you register and have their permission, you can do a credit check - about a hundred bucks:
www.tpn.co.za
And then you can also buy a lease template:
Home Page
The TPN Credit Bureau delivers specialised data and services to residential and commercial property owners and managers as well as schools and other businesses.
And then you can also buy a lease template:
TPN Product List - TPN Shop
shop.tpn.co.za