Try the Brisbane bicycle touring association http://www.bbta.org/ we rode with them a couple of times when we toured Queensland in 2008 with the Cycle touring association of western australia. Good folks, will give you a chance to try a bunch of different rides and learn about what does and does not work in regards to bikes and gear. It would also be a chance to meet potential ride partners and make sure you are compatible travelling buddies before heading off into the unknown. The adventure cycling association in the USA also has a section in their magazine and online for finding touring partners.