ESXI on external Hard Disk

I have few questions,

• Do we have the free licenses for personal use
• When i say personal use, i want to install ESXI on my external hard disk, Is that possible ?
• What IP i should assign if i can install ESXI on Hard Disk
• If i can install ESXI and on HD and i create few VM, Can i access those VM's by its IP address ?  If yes How ?

Thanks,

Avadhoot