1. Check the system requirement, if the current hardware supports ESXi5.0 in vmware HCL.
2. Format the USB Flash drive to boot the esxi installation, refer below link for how to format USB Flash drive.
3.Boot with ISO image that is on the vmware site for esxi 5.0 embedded.
refer the below link for more detailed explanation.
Thanks for the fast reply.
Will do the steps 1. and 2.
The third link refers to the same first link, how to boot and install - is there the link for that?