Aussie's will get a new 30day Visa Exempt entry OR if you go to a consulate/embassy and buy a Single Entry Tourist Visa you'll get a 60 day entry stamp. Both can be extended by 30days at immigration offices inside Thailand.
Note for visa exempt entries most countries are limited to only 2 by land border each calendar year.
At BKK (Suvarnabhumi) you don't need photos or copies of anything - they do it all for you but charge a 200B fee ontop of the 1000 for single / 3800 for multiple.
Like Richard says above - inside security area of departure zone 2 (before passport control)