Sorry - very new to this!

I'm trying to write a script to add and remove networked printers.
I need to say something like.....

If user is connected to \\oldserver\oldprinter then add \\newserver\newprinter and delete \\oldserver\oldprinter

with possibility of setting it to default if old printer was default.

If anyone can give me some pointers as to how to script this I would be eternally grateful.
Thanks