Hi,
We came in Sept a few years ago with a five year old. He’d had the six week school holidays in the uk but then due to us having to find a rental and then school holidays falling here in Sept, he missed about 12 weeks school by then and we were all climbing the walls! So bear in mind that when you come, you’ll have to take into account when the next school hols fall here as you can’t enrol at a school until you have a permanent address. The summer break here is probably a good time as then your daughter would be starting a new school year with the rest of them.
In terms of finding a school, if you live in the catchment, you are guaranteed a place.
There is a website but I can’t quite remember the name, if I can find it I’ll let you know. I think Rossmoyne who is a moderator on this site is very knowledgeable in the education area so hopefully she may offer some advice.
If you look at NAPLAN results for the schools here, it’s an indication of how they fare academically in year 3 and 5 but it’s not like Ofsted in terms of the overall indication of the school. Hope this helps!