Be sure to post your resto thread in the $3k+ section.
Best way to approach these things is really just to get stuck in, but proceed only at a rate youre comfortable with - no point in doing all this work if you end up damaging something or not being able to re-assemble the thing! Not that either situation is very likely haha, these machines are really quite simple in an engineering sense.
Before getting stuck in, you could test to make sure the element is going (have it going just long enough to ensure the boiler is getting warm), and that the electronics are still good (electronic controllers are a VERY expensive part to replace - you could probably buy another ex-industry machine for the same price!)
Other than that, get stuck in and start taking those photos! Be sure to post up pictures of anything youre unsure about, and dont be afraid to ask silly questions :)