Wow! That's a bit of a distance! I've had to move my family twice and I know it's no picnic! Is there anyone you can ask for help? Don't be afraid to ask!! If there's one thing I've learned, there's almost always someone willing to help - whether it's just to babysit or help pack - don't be afraid to ask!!!
Also, take a deep breath and just take it one step at a time! Don't be worried about the schools right now; unless your husband is looking into them while he's already there, there's not much you can do other than research on the internet.
If your husband is already there, then he's obviously living somewhere. If push comes to shove, the worst that will happen is you'll have to put your stuff in storage for a little while until you find a house and live with him. I'm guessing it will be cramped, but it's only temporary! Be sure and keep out what you'll need for the first few weeks after arrival.
Mark your boxes so you know what's in them! That will help immensely.
As for being away from your husband - I know it's tough but just keep thinking it's only temporary!!! My kids and I have been living four hours away from my husband/their dad going on three years now! We get to see him MAYBE twice a month - depends on what projects he's working on - he's a design engineer - and when things get very busy, we may not see him for two months at a time. It's been tough but it was the best decision we could make at the time after him being laid off for over a year - we knew we couldn't sell our house very easily because we have a lot of ground, plus, I didn't want to pull the kids out of school - they had just started high school. He continues to look for jobs closer to where we live but there's nothing available.
I felt like you every time we moved but everything always worked out! I know no matter what I say, you're still going to feel stressed - been there!! Just keep thinking of the end result and in a couple months you'll all be settled in a house, registered at school and live happily ever after!!
Good luck!!!