While the "old" Singers are very good machines, one reason for their popularity is that there were millions and millions of them made worldwide and therefore are readily available.
From what little I know, Bernina's are a high quality machine. Is that a 730?
Yes, I belive it is a 730. Just started using it, but I found that it need a little oil.
So I'm googling for manuals. In the kit with the mashine I found several different feet, maybe (if I'm lucky) there is one for sewing flat seems! That would make things easier.