Wow, interesting topic. My thoughts...
1.) Does anyone know how good international schools are in Poland?
Outside of Warsaw, they seem to be rather poor and overpriced. There are some good ones in Warsaw, as you'd expect - with equally eye-watering tuition fees.
2.) Is there a way to transition my daughter from an international school to a Polish school?
It's almost certain that she'll have a difficult time - Polish private education is remarkably different to public education. Just think - how would she cope, going from a small class to a big class? It's not that simple at all. If she's to have any chance, she needs to start from the beginning.
While I've not personally heard anything about the Polish language courses in Poznań, the reviews on this forum were less than favorable. However, I have a good number of contacts in Poznań- from my school/work and from conferences I've attended. Having professional connections would increase my chances of getting a job, and I have a social circle to help with my transition there.
There are no good courses in Poznań. There are some good teachers around doing private lessons, but coursewise - nada. The only real course that exists is the one at UAM - and this is aimed at students, not outside learners. It's also taught by people who appear to have little to no training in teaching Polish as a foreign language.
Honestly though, much of this will be determined by the job scenario- what I position I can get, and whether I can afford to live in the same location as I work. I imagine with my credentials I can find a job, it's just a matter of how good of a job I can get (in either teaching English or editorial work).
You need to consider one thing - how much money do you think you'll earn?
My husband is not an English teacher, but I have looked into some options for him as he picks Polish, and he would be comfortable staying home as a house-husband/ working as an English conversation partner. (Again, I have to do a lot of planning for this still.)
There's little to no demand for English "conversation" partners in Poznań. There are plenty of students willing to charge 20-25zl an hour for this - and with this type of price, you're not going to get reliable clients. I'm not saying that you need to be qualified, but your husband really needs to bring something else to the table apart from just speaking English.
The other thing - could you really afford for him to stay at home? You're not going to get a well paid job in your first couple of years here - I can tell you from personal experience that in Poznan, there are very, very few schools offering full time hours. Even the big schools (Empik, Profi-Lingua et al) aren't offering their natives a full teaching load. There's plenty of small contracts on offer (last count, I have 7 contracts with schools!) - but this needs the ability to have the time to build these up. It's only within the last 2 weeks that I have a full time schedule this year that doesn't involve working horribly unsocial hours.
As for working as an English teacher - are you prepared to work mornings (7-10) and then 5-9 in the afternoons? Have you considered that you need a work permit for every single school you work at, and that if you move here, you'll need to obtain legal residency within 90 days?
I'm sorry, but it just doesn't sound like a good idea to move here at all with a family to teach English. The ESL market is ridiculously unstable - and while you might get a job at a university, personal experience tells me that jobs go to those who know someone - and even then, the universities are starting to cut back on natives because the competition is so fierce (and the Polish teachers are so good).
I imagine with my credentials I can find a job, it's just a matter of how good of a job I can get (in either teaching English or editorial work).
Don't be so sure of it. Finding a job is one thing - but finding a stable, well paid job is another thing.
Bear in mind that if the school cuts you midyear (and this happens more than you might want to think) - what then? It's not going to be possible to find a full time job in the middle of the year, and you'll have a husband and daughter to feed.
My advice - go somewhere like the Middle East or Asia. There'll be much more stability there - as well as there being much more in the way of money. Do you really want to risk having no money in Poland, with no access to public help?
Warszawski is bang on the money with his post. It just doesn't make any sense to come to Poland without any teaching experience (here, they'll look at post-CELTA experience) - especially when you can end up with nothing because of a neurotic director. And they are much more common than you probably imagine ;)