Hi Jo, welcome to the forum. You've purchased a machine which was available in the 80's. Someone, somewhere would have had one but your best bet would be to contact Vorwerk direct regarding a manual for this machine. Where do you live? Here in Australia the machine wasn't even available here way back then.
This is the only person I know on the forum who has a TM3300, he is in the UK.
I'm sure once you know how to use your machine you will get a lot of use from it, please do let us know how you get on with your enquiries.