I am not permitted by law in Australia to consult/assist in the capacity of an australian based business and in practical common sense I prefer to guide you to someone that will give you proper advice.

You are intending to be based in Phuket and have frequent visits to that location, I therefore recommend Kh. Duean, my Thai lawyer and good friend, she is based in Phuket 

My reference / introduction to Kh Duean is extensive, I’ve known her for some 8-10yrs, introduced many satisfied customers from Australia.

This is a web link to a wab page I made some time ago, it’s not elegant but it provides the essnetials

http://www.austhai.biz/AusThai/thai-clients-1/thai-business-law