Hi Goose. I wrote you a long reply yesterday which the computer ate so will try again now.
Catchment: your Rathaus will be able to tell you which school you should go to. If it's a small town there may only be one. If you want to attend a different state school, you can apply to that school with a 'Gastantrag' and they may or may not accept you. In my small town there is one primary school but there is also a Montessori. It is kind of semi-private, but the fees you pay are in no way like private school fees in the UK - it's just a couple of hundred Euros per month.
If there is one near you, it may be a good option for your DD. In my area we have quite a lot of expats and several of them have put their kids into the Montessori as a less stressful / less test-filled school experience, especially if they were not planning on staying forever. I'm not sure if you're staying in Germany for the longhaul?
To reply to your other stuff, I think you will struggle to defer your DD if she is seven this August. I tried to defer my DS as he was not six when he had to start school. But because school and Kindy said he was fit for school, they were able to overrule me.
We live in the arse end of Bavaria but my kids' school has had to get to grips with a huge amount of immigrants in the last couple of year (my kids' primary school has 45% of kids with a 'migration background'
and that statistic does not include my kids!). I have seen foreign kids join my DDs class in year three and by year four, they were doing all the same work as the rest of the kids.
One boy in my DDs class was from Afghanistan, had an illiterate father and both parents spoke crap German and he is now in year five, holding his own in mainstream school. What I am trying to say is, this is a child with a far from ideal home set-up for supporting language learning and homework in German and he is coping rather admirably. I think your set-up will be very more advantageous for your DD and the fact that you speak some German is excellent.
I think all schools now offer 'Ganztagesklassen' - all day schools. This means school til 15:30 Mon-Thurs and short day on Friday, warm lunch at school and no homework except at the weekend. If you were coming to my DS' school, they would try to push this system on you as in our school, they struggle to fill the class. It wasn't always this, but it has become a bit of a non-German speaking melting pot. It's great for the parents of these children that they are relieved of homework during the week but I think it is hard for the children to really immerse themselves in well-spoken German. My DD was in the all-day class but I decided against it for my DS as I wanted him to hear more native-spoken German.
Our primary school finishes at different times each day, which takes some getting used to.
Your Rathaus will also be able to tell you what nurseries there are and you can approach them directly to see if they have a space. In my area the nurseries are all church-run, the majority of them Catholic. This may be the case where you are going (but they are more likely to be protestant up there!) Oh and you will love the nursery fees - you will only pay about 100 Euros a month for nursery
.
For property, have you tried immobilienscout24.de? You will find rental property there as well as houses for sale. Or find out the name of the local paper. Our paper has property on a Saturday. You should be able to find it online too.