Welcome to the Breeze Smitsar.
In my humble and underrated opinion and being that you are new to the SUP caper I would get something between 10'6" and 11'6" and 29" to 31" wide.
There are plenty of good brands on the market. Fanatic, Naish, Starboard, JP, NSP etc etc. these are all great boards and good quality. They have a broad variety of models and shapes.
The alternate if you are a newbie and not sure if SUP is a long term thing is to buy one of the cheaper brands such as Atlantis and others that you will see. But be warned whilst these boards are quite a lot cheaper you get what you pay for.
If I was buying a first board I would look in the Sale section of Seabreeze. There are heaps of boards around the dimensions you are after and most of them are good brands. They are generally for sale because the seller is stepping to the next level in boards.
Not sure who your supplier is up there, but you aren't too far from the Sunshine Coast and there are several reputable shops in Noosa, Maroochydore, Cotton Tree and Caloundra that can give you advice and have a good range of brands and craft.
Don't buy something that is too small for you and hubbie nor something that will be good when you get better or more skilled. Buy something that suits you now and upgrade as your skills improve.
Have fun.
ET.