First let me say I am SOOOOOOO jealous. You really really scored HUGE. Robotron is very sought after in case you did not know.
I would start by reading alot. Check out USENET groups as well and just locate a load of info if you are serious about restoring the machine (which you should be, dang what a great find)
Generally I would start by getting a hold of a Robotron manual with the wiring schematics. Alot depends on your electronics aptitude. You will need to really bone up if you are not already there.
Figure out what IS working and in good shape, then prioritize the rest. Wow you have alot of work ahead, but DANG what a find.
I too will take it off your hands if you feel overwhelmed

Good luck, can't wait to see how it goes.