hey there and congrats on your bubs!
a few of my friends have had prems born and home on O2. they found places like ausprem a great resource- so it might be worth looking them up!

i have seen one of my friends following her 3 year old around up and down a playcentre with the long tube of O2 follow- quite a sight! She was a 25 weeker. He other son who was a 32 weeker was on O2 for 12 months- but was the bigger of twins.
My twins were born at 30 weeks but did not need to come home on O2.

take care hun and hope that your prem journey doesn not have too many bumps in the road!