New Owner. Boot to full privileges

New Owner. Boot to full privileges.

Hopefully I can explain what I need to accomplish clearly.
I have purchased a brand new Wyse C90LEW running Windows XP embedded.
I want it specifically for it's small size as it will run engine management software in real time in a functioning vehicle
I want it to boot to an account with full administrative rights and no password and run software which will be installed on a 64gb SanDisc Cruzer Fit usb drive.
I need it to connect automatically to a wireless network and have Bluetooth capability. (I have a tiny usb dongle)
Long term I would like to boot directly from a small usb hdd to a full install of XP Professional.
I am new to thin clients.
Where do I start making changes from the default setup?