What steps should I take to extend my stay in Thailand beyond the initial 30-day tourist visa with a Thai spouse?

worst to worst peter, quick flight after 30 days gets ya another 30, so ya can do that easy enogh and cheap enogh say cambodia also dont forget if your going roiet again, thats not million miles from mukdhan border with cambodia, maybe only get 2 weeks, not sure of current made up rules but ya maybe only want 2 weeks or maybe ya get 30 worth a chat in that office.

400.000 tb in a thai bank to .

You could also probably get a 90 day Non-Immigrant Type O visa based on marriage to a thai from a thai consulate in Oz before you wing your way here too.

Then you could either go for the year extension or just the 60 day visit family one..

If all you're wanting to do is stay until July, get a single entry tourist visa from a thai consulate in your country BEFORE you come here, then extend that at the immigration office for 30 days and then extend it again for 60 days based on visiting family. That gets you to july

First there is no such thing as a 30 day tourist visa, so you'd be comin' in on a 30 day visa exempt entry.

You can't have a blue house book because unless you have permanent residence status or hold a thai passport a foreigner can't be listed in it. Foreigners get yellow house books.

Be that as it may, you would apply for a 90 day Non-O visa based on marriage to a thai at the local immigration office. Then once you had that you would apply for a yearly extension based on marriage. Both require proof of financials where you either have 400K baht in a thai bank account in your name only for the requisite seasoning period OR you have a notarized letter from your consulate stating you get 40K baht a month in income.

I would make a trip to the local immigration office where you live once you're here and get the hand out sheet they have which lists the requirements.