I wish you well but am afraid that all is not necessarily rosy...the saeco bar is not commercial by any means and does not operate like a commercial. The biggest difference in the modus operandi would be the steps involved in making steam and then going back to coffee mode.
This is important, because if you get it wrong and blow the element ( or even if you dont and sometime down the track it fails for any other reason) it is very possible you wont get a replacement. Some of the parts in many older machines like this are well obsolete and it can cause some grief to those wanting to repair and service them. That doesnt mean you would not get the machine running again as there are companies that will replace the element in the brass housing you supply, but it will be costly for a one off job.
The owner booklets were next to useless but good for you if you want one and can get one. As stated the most important thing is to make sure you do the steam / coffee transition properly so as not to cause failure and the problem with replacement.
For descaling you can use any proprietary descaling solution and some of the products available today may well be better than whatever may have been recommended in the booklet all those years ago.
There are a three places in Melbourne that I know of that had a lot to do with older (original type) saeco domestics and where you might turn to in the event of a service problem, and another in Sydney.
Hope that helps.