Looking for Rosson OR Richardson 1812 England

I am looking for any information on Isabella Rosson and William Richardson they were convicts sent to Australia on the frist fleet in 1788. They sailed back to England in 1812. I was wondering if anyone had anything on them as I am trying to write a novel about their life as they were the first teachers in Australia.Isabella and William both served 7 years transport Isabella for theft and William for highway robbery.
Any information on these two will be much appriciated.
Thanks Julie.