Choosing an attorney, and what happens if you do not have one
If nobody is appointed, the law appoints someone for you.
Your attorney must be at least 18, must not be bankrupt if they are handling financial matters, and must not be a paid carer or health provider for you. You can appoint more than one and say whether they act jointly, meaning together on everything, or severally, meaning any of them can act alone.
They are bound by statutory general principles: to act honestly and with reasonable diligence, keep their money separate from yours, keep records, and give effect to your views and wishes as far as they can. If you have no enduring power of attorney and you lose capacity for a health decision, Queensland law provides a statutory health attorney, which is the first available and culturally appropriate person from a set list: your spouse, then an adult carer, then an adult friend or relative, and if none of those is available, the Public Guardian.
For financial matters there is no equivalent shortcut, and someone would have to apply to QCAT to be appointed administrator, which takes time and money at the worst possible moment.