Hi Karen,
Sellicks is a nice spot on the southern most fringe of what you could call Adelaides sprawling metropolis. The area has a lot of holiday homes and B & B's.
It would be approximately an hours drive from the city center and is serviced by public transport, if you find work in the city you would have to consider the travelling time to and from each day.
Shopping wise there is a general store but no large supermarkets. The closest supermarket and mall to Sellicks would be at Aldinga a 5-10 minute drive north.
Here is a link to the Onkaparinga Councils website that will provide more information on the Sellicks area,
http://www.onkaparingacity.com/web/SearchR...ellicks%20beachJet :)