Uh well it doesn't help that you live in a different country first of all, I can't really answer any questions pertaining to legalities, since you live in Australia.
I would assume that it would be legal there, as it is here in America; basically as long as someone gives you money willingly, you are committing no crime, since it was an exchange between two people, however I would check with the laws in your country though.
As far as online ticketing goes, I used
www.acteva.com, an event management company who helped plan everything. They were very helpful in that they managed all my money, set up a nice webpage, and were able to process credit cards, however they were very slow to get the money to me (i still have yet to recieve the rest of my money from FAST, an estimated 3100 USD). I would recommend taking this route for anything you would plan, but go with a different company for sure. Paypal is also a good option but I don't have much experience with that, so I can't tell you for sure.
Hope I could help. :colorful: