I don't really have school aged kids yet so can't say too much about the schools. My daughter just turned 4 over Christmas so she's in prep-prep right now (like preschool). Next year she will start Prep (like Kindergarten). If you want more info on these grades let me know. My son is only 18 months old so he's still pretty far from school at this point.
I've heard the schools in the area are pretty good, although some are better than others. Luckily you can choose the school you want and it shouldn't be a problem, although you have to transport your kids to and from school. My daughter is in preschol in Cleveland, which is about 15-20 minute drive, so not too far away.
There are also private schools here. Ormiston is considered the best in the area although very expensive. So unless you've got lots of money to spend I wouldn't bother looking. They also have really long waiting lists too.
My husband does work in the CBD. He takes the bus from a block or two from our house and he gets to work in about 35 minutes. But he's got a 5-10 minute walk to get to the bus stop and the same to get to work on the other end. So it probably takes him closer to an hour door to door. When we first arrived in Wellington Point he used to take the train. It was about 45 minutes to get to the CBD. The train stops in Birkdale, Ormiston and Cleveland (end of the line). From Cleveland it's probably closer to an hour trip.
If you're thinking of Alexandra Hills you wouldn't really be on by a train line. The closest would probably be Birkdale which would be about a 10-15 minutes Drive, or possibly Wellington Point or Ormistion would work depending on where in Alexandra Hills you were. For us the Birkdale station is the closest though and it takes me 12 minutes to get there.
You can look at maps at:
www.whereis.com.au
I think you can see the train line on there, it should look like a think black line with little black rectangles for stations.
Here's a link with a map of the train lines:
http://www.translink.com.au/qt/translin ... ex/tr_main
For the map, click on "Network Map" Look for the Cleveland line that runs from the centre out to the east.
You can also look up the timetables for the different lines to see when the stops are. Alternatively you can punch in some addresses on the right and it will calculate your journey for you.
As far as driving to the CBD I would expect about 45 minutes if you weren't driving at the peak, and about an hour for peak driving. Parking is very expensive so most people don't drive in but use the bus or train instead.