My top tip would be don't go:)
But that's not helping you. Ramadan is probably the worst time to go, and its very hot right now. Most people who can will have left already. They won't be back til the day before school starts, if they can possibly help it.
Personally I would call schools NOW to see if they have any places, as you'll find you don't choose the school, it chooses you. Its a bun fight for schools out there with great difficulty for places. Unless your dh company or yours has a debenture with the school.
Have a look on expat woman ( very heavily moderated) and dubizzle for housing options. Traffic is a nightmare. Make sure your driver speaks English, and make sure you have a sat nav, as they get lost in seconds, unless you're heading for Dubai mall or the airport.
Take lots of water everywhere you go just in case, but keep it hidden as its Ramadan. Only let the children drink in public, you'll have to hide in the loos. No food or coffee shops will be open during the day.
Make sure your husbands package covers everything as its VERY expensive. Tutors - contact the schools or you might be lucky and find a bored expat teacher mum to help you.