Snowflake - you have been given some very good advice by those here on the board. Everything said is very accurate.
It really depend on what you are looking for - subdivision, land, etc.
Do a google search for Louisville Metro - there you will find many links and info to Louisville and what it has to offer, along with info on the schol districts.
You can narrow in on the specific cities and schools mentioned, as I have found most have their own sites, and give detailed info.
Another thing I always suggest is checking the Hihlands area. Older homes in a wonderful, diverse neighborhood - and so many things to do it is amazing. All depends on your preference.
The following is a very nice little site I discovered that gives good info. I think you may find it helpful, and you may contact her for additional info.
http://www.heidiamshoff.com/
Oh, and remember - Jefferson County has an open school system, as does Bullitt and Oldham. Meaning - if you can provide transportation, your child can attend any school, whether in your district or not. This way, if you prefer a magnet school or traditional school, you may search it out at
http://www.jefferson.k12.ky.us/ - and find a school right for the kids. Take into account what your kids are interestd in. If your fiance's child is interested in the Military, Jefferstown (j-town) has an EXCELLENT JROTC program - and the school is top notch. J-town is minutes from downtown via the expressway system, and is an 'old' city with many amenities. Would be one of my top picks if relocating right now.
You may actually want to begin your search this way, and center your housing around that, which is the approach I have taken in the past.
Good Luck and Welcome! You will not meet a stranger here - escpecially when you get into surrounding counties and areas.
KimmieyKY