I did my First Aid through St John's Ambulance and my Dad did his through QLD Ambulance. It's a two day course, 8 hours a day, and you can't do it online. I'm sure if you call St John's Ambulance, QLD Ambulance (or relevant Ambulance body in your state) you'll be able to find a course near you, or organise one in your area. They're easy to pass.