I've been following your posts, welcome to the sport.
One hour North from Brisbane are some realy great spots to sail, especially for beginners. Starting at Golden Beach, Caloundra going up to Lake Weyba and Lake Cootharaba. Lake Weyba is the perfect spot as it's only knee or waist deep and has no current. Lake Cootharaba is perfect for camping or stay in one of the hotels at Boreen point.
The WindWanderers is a windsurfing club at the Sunshine Coasts and they organize, among other, Windsurfing camping and free lessons on various dates and locations. The next one is on 9th of Feb at Lake Weyba. This is the link
http://www.windwanderers.org.au/Calendar.aspx You and your family are very welcome to join in. We'll have 4 to 5 beginners boards on the water and plenty of experienced sailors to assist you.
Hope to see you on the water one day and happy learning

Cheers,
Peter