As for preparing, it was more to make sure. vCloud director only communicates to vShield/vCNS ... not to the Nexus 1k.
To be honest, the most common implementation I have seen with Nexus 1k + vCloud is using Port Group backed pools. Have the 1k provision a series of Port groups, then assign the port groups to the Network Pool.
I know it possible, given that I have seen it in posts elsewhere: Cisco Nexus 1000V and vCloud Director 5.1 | Tom Fojta's Blog