*Don't rush out and buy workbooks/curriculum based activities, to begin with. You will probably never use them and other things will show themselves to be more relevant to your home ed after a while.
*If you move don't bother informing the LA. You are not obliged to by any law, enjoy a hassle free time educating your child instead.
*Find the home ed community locally.
*Take time to Deschool especially as your child sounds like she has had emotional and anxiety difficulties with school. Time will aloow you to decide what sort of home education suits your family best.
*Join the Home Education:Special Needs email support list people there are the real experts in home educating children with SEN-the parents actually doing it. You'll find a welcome and support there from people who know exactly what you are going through.
*Read Home Educating our Autistic Spectrum Children: Paths are made by walking
"Mainstream educational provision for children on the autistic spectrum can be inadequate or inappropriate. An increasing number of parents dissatisfied with the education system are looking elsewhere for an approach that will suit their children's needs. In "Home Educating Our Autistic Spectrum Children", parents who have chosen to home educate their children with autism or Asperger's syndrome candidly relate their experiences: how they reached the decision to educate at home, how they set about the task, and how it has affected their lives. Following these personal accounts, the final chapters offer practical advice on getting started with home education, legal advice from an expert in education law, and contact details of support organisations"
For us, the only downside was having much less money than we otherwise would have had, but oh, the pay off of having happy self confident children back, with a sparkle in their eyes, has been so worth it!
We felt we had been forced into home educating our children because of their deep unhappiness at school and their schools unable to meet their SEN. It soon became a lifestyle choice though, and nothing would have made us send them back. We've had such a good time with our children, since we deregistered them, they have thrived and been so happy and so very successful (outperforming by miles every prediction their schools made for them, by miles!)
My single regret is that we didn't find out that home ed was a legal viable option, and deregister them years before-or better still never ever to have sent them!