Hello everyone!

I'm planning my first non-rev trip from LHR-SYD via BKK and I'm a bit confused (and nervous!). Can anyone tell me what to do when I arrive in Bangkok? What will happen to my checked luggage? Do I have to reclaim and then check it back in? There's only a couple of hours between landing and departure, isn't this going to be cutting it a bit fine?

Also, if availability is only showing 8 or 9 seats 24 hours prior to departure is this a bit risky?

Any advice anybody can give a first-timer would be greatly received! Thanks