These are the basics for the Australian visa from Thailand as you will note. You will need to ensure that your marriage is registered and that you have the correct Australian visa for a Thai national much like any other visa. If you are not married then you will need a fiancee visa or a marriage visa for Australia if you have already registered you marriage while in Thailand.
The Australian Tourist Visa (Subclass 600) is a type of visa available for Thai citizens who are planning to go to Australia for tourism. Australia has also been a popular destination for Thais who wish to explore the educational and employment opportunities, meet with Australian friends, be with loved ones and relatives. Obtaining an Australian Tourist Visa is difficult for most Thais because the paperwork requirement for the visa application is complicated especially for first time applicants.
Child custody becomes very important when you are going to be leaving Thailand and your wife or Fiancee has a minor child. There may be issues with the visa and setting the child in Australia if the biological father objects if custody was part of a divorce settlement. Always take legal advice when there are children involved. The child would require an Australian Child visa to move to Australia if the mother is moving to Australia under an Australian spouse visa or Australian Fiancee visa. Always take legal advice in this regard.
Prenuptial agreements in Thailand or so called, Thai pre-nup is a written agreement or contract made between two people before entering marriage. This, in general, enlists all properties or assets of both parties, specifies what property rights will each have after the marriage and also outlines how each wishes to divide marital properties in the event the marriage is dissolved in death or divorce. This only deals with the personal and marital property of husband and wife.
This is Thai marriage registration. If you have had your wedding ceremony in Thailand you now need to register the wedding in Thailand. The very same goes with an Islamic wedding in Thailand. Both Christian, Islamic and Buddhist weddings are not valid in according with Thai and Australian law until it has been registered with the District Office in Thailand.
The Prospective Marriage visa (subclass 300) is a visa which you have to apply for from outside of Australia. The purpose of this visa is to take your Thai fiancée from Thailand to get married in Australia. Note that like most fiancée visas there is a time limit. The visa is only valid for 9 months once you enter Australia. You need to get married in Australia within this 9 month period.
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If this is a same sex marriage then you need to speak to an immigration lawyer about your options such as the Australian partner visa. As gay marriage or same sex marriage is not recognised in Thailand or in Australia and t has its own requirements for Australia. See the Australian Partner visa for more details on this website as this visa is based on marriage however you can apply for this visa based on a de facto relationship and not based on marriage.