Hi Vicki and welcome,
Well after reading all that advice, I strongly believe you've made an excellent decision. You have scored the perfect scope for a newcomer to the hobby (and for a 10yo!)
All the usual recommendations will pop in here:
http://stellarium.org/ for a great free computer planetarium and for some extra goodies look into a Telrad finder. A lot of people swear by them.
You have a astro club on the Mornington Peninsula
http://www.mpas.asn.au/ I'd look into them if your time permits. I'm sure you and your son will will be most welcome to some observing evenings!
Congrat on a great purchase, and look forward to hearing all about your first light!
Regards,
Stephen