We are looking at schools too at the moment, my DD will be starting prep next year too.

I think definitely look at a few as then you get a sense of how the schools feel. Take note of how the kids seem (are they happy/engaged? Does it feel like a nice place to be?).

Questions I have asked relate to class sizes, teacher retention rates, any play-based or inquiry based learning, specialist teachers for music/PE/performing arts, language program, intervention programmes for kids who may be strugglilng a little, green/recycling programme, anti-bullying and inclusive programmes, facilities (library, computers, art room etc) and how often they use these. Also which secondary schools do lots of the kids go to?

Good luck! Although the danger of looking at too many is that you might end up with more than one that you like. This is my problem right now lol!