Hi Hooch Wombat, welcome to AFF.
This should answer it for you: What are Married Segments?
To get acquainted you might want to read some other general articles online. Here are a few from this site:
www.australianfrequentflyer.com.au
www.australianfrequentflyer.com.au
Absolutely. You should book your flights exactly 353 days after they become available (as early in the day as possible to try to snag those seats before other AFF-er's do!). This does, as you note, require using the call centre to add additional flights after the first booking via the online multi-city tool. Also see here for the number of days in advance that various partner airlines release their flights: Qantas Oneworld Award Planning (wiki content) - Australian Frequent Flyer
As an ignorant newcomer what does married segments mean?
This should answer it for you: What are Married Segments?
sorry for the basic questions but I am a total newbie
To get acquainted you might want to read some other general articles online. Here are a few from this site:

How to Fly Around the World with a Qantas Oneworld Classic Flight Reward [Mega Guide]
Fly around the world with Qantas and other Oneworld airlines by redeeming points for a Oneworld Classic Flight Reward. Photo: Qantas. Did you know that


Qantas Oneworld Award Not Just for Round-the-World Trips
The Oneworld Classic Flight Reward is a very popular Qantas Frequent Flyer redemption, and for good reason. For just 132,400 Qantas points in Economy or

should I risk starting a booking online with segments that are available now and adding through call centres once to other dates open or is it safer to wait until my return flight date opens up (September 20, 2023)?
Absolutely. You should book your flights exactly 353 days after they become available (as early in the day as possible to try to snag those seats before other AFF-er's do!). This does, as you note, require using the call centre to add additional flights after the first booking via the online multi-city tool. Also see here for the number of days in advance that various partner airlines release their flights: Qantas Oneworld Award Planning (wiki content) - Australian Frequent Flyer
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