Appended please see input as questioned.
Can i include my wife, my kids all in one application or does my wife need to apply separately, if yes does she need a separate immi account? - you can have one immi account and have separate applications in one account; depending on age kids will be part of parents applications.
Does anyone have a dummy completed application form? - its pretty straight forward you dont need this and to be fair everyone will have personal information that no one would want to share i am sure you would appreciate that
What documents do we need to attach? - please go through this page and you will find all the details; complete application, your passport, marriage certificate, drivers license, utility bill and form 1091
Any other info that is helpful - as i mentioned please review this page and you will find tons of useful information
All the best.