I'd add to the good advice on here, say 'yes' to everything proposed to you (well, almost everything) for the first six months. That will make sure you're really busy, and that will help you get to know they place and get through the worst period that has the highest potential for depression.
After that, you can start to be more discerning.
Also, make sure your DH it utterly supportive, and is in agreement that the transition for you will be a million times harder than it will be for him.
He will have a job, with all the structure, support, meetings, adult conversations, and most importantly, status, that provides.
You will not have any of that, and you may well feel quite invisible for the early days.
As others have said, make sure you're both comfortable about finances - you don't want to not only lose the status you had through your job, then to be asking for your weekly allowance too. Make sure you hold the purse strings, and every penny he earns is absolutely joint.
Getting a job, even unpaid, part-time volunteer work, will be (IMHO) the best possible thing you could do to ease you into your new home. If you can organise a placement before you leave the UK, so much the better.