WARNING- Extreme easily confused newbie here!

I travel to Perth approximately every two years and do very little flying before then.

I flew to Perth December 26th from BWI and returned Feb 3rd.
I flew on AA in the US to LAX and then on QF to/from and within Australia.
All miles were credited to my AAdvantage account which had a fat balance of 0 on it. Does this mean I am automatically a member of the oneworld alliance?
Are the miles on my AAdvantage account now considered oneworld miles?

In reading the other forums about MRs it seems that one needs a goal / reason for doing the MR's. Some people would like discounted travel, others would like upgrades / lounge access.

If it is my goal to either earn discounted travel for my biannual trip to Perth or to earn upgrades / lounge access am I on the right track?


Thanks,
-Giles