Best Structure to purchase a business - seeking advice

In the early stages of looking for advice, ideas on best possible way (tax effienciency/liability etc) to structure a business purchase in Aus. My wife and I are looking at purchasing into our family business. The business turns over between $100k and $160k a year.

Which structure would be most suitable - our current combined income is roughly $200k and we would both continue to work as this is a weekend wedding business. Any information on company structures, family trusts etc would be greatly appreciated. TIA