Automation of ESXi5.1 through script

I need to automate ESXi 5.1 installation from a powershell script.

For This to understand how PXE works we done with setup of DHCP on Virtual m/c having Windows 2008 R2 and TFTP server on Ubuntu 11.10 nd also PXE setup on Ubuntu virtual m/c.

Now using PXe setup i need to automate ESXi5.1 installation through script.

Not getting how to start..?