Does living in AUS mean you live in Austin, Texas or Australia?

RTW tickets are priced based on the country in which the journey starts and (with a weird Canadian exception) have to be issued ("ticketed") in that country.

Prices vary from country to country - and some countries are cheaper for business/first tickets and some are cheaper for economy tickets. If you want an economy ticket, Australia and the UK are two of the cheapest (of the "major" countries) in which to start. However, if you want a business or first ticket, they are two of the most expensive.

(Except for the weird Canadian exception) you pay the higher of the price for the country where it is ticketed or the price for the country where it starts. That generally means you (a) start the ticket from the 'low cost' country (b) figure out how to get it ticketed in the low cost country and then (c) figure out how to get yourself to the low cost country. Alternatively, you give up and just start from wherever you live....

If you can provide some input on where you'd like to go and what class (F, J or Y) you want to travel in, then there are lots of people around here who can provide good advice.