sorry to hear about your story i wish you do some basic dba reading to understand oracle terminlology you are talking about running 11 instance rember oracle reccmmends atleast 256 mb of ram per instance for any productiuon work and simple airtmatic of multiplying that by 11 would require 2816 mb or approx 3gb .1 gb wont suffice.

hope that you would pick up dba skills quickly even i was in a similar situation couple of months ago.

btw that much memory is required bcoz a instance always runs in a memory while a databse from the hard disk