Is there any way to send a Vector3 array from the server to a client?
So many it probably would bust the max character count trying to write them all down.
The best way would be to grab a network library like UNET, or Photon. Or if you are feeling adventurous, check out TCPClient and TCPListener. And if you are crazy with waaay to much time on your hand just use sockets and enter a world of pain.