There's a thread which might be helpful to you here, Nikk.
I think it's normal to feel overwhelmed when you first take your child out of school to home educate. I found making a plan very useful. Like most new home educators, I also bought far too many books, but I am hoping they will get read one day by at least one of my children.
Every home educator does it their own way and every home educated child is different and needs different things, but here is what I did:
First, I looked at what DS1 would be learning at school and considered which subjects he should still do. I decided that he should keep studying Maths, English and Science. Other subjects were encouraged, but they were more his choice.
DS1 does a little bit of those three subjects every day. When I say a little bit, it really is only 15 minutes sometimes. We are working through a Science workbook with marked assignments from the Little Arthur School, but that is not necessary and I probably won't do it again. However, it made me feel better to pay for a course. Next time, I will just buy a textbook and we'll work through it together.
For Maths, DS1 has a tutor for an hour a week and then uses Galore Park workbooks, BBC Bitesize and Education Quizzes the rest of the time. The latter is good for all the subjects and I often get DS to do one of their tests after we've studied a particular topic. He really loves doing these quizzes.
We have tried various online Maths programmes and some children love them, but DS doesn't, so I haven't pushed him.
I am an English graduate, so I cover English myself. We read together and look at grammar (one of my bugbears). At the moment, I am reminding DS of how writing can be used for different purposes and he has written some pieces about our new kitten. So far, he has written a description of the kitten, then a leaflet about how to look after your new kitten and today he is going to do some research into how cats became domesticated and write about that.
We also study topics, as they cover so many different subjects. For example, we looked at slavery in Black America. This involved historical research, reading, writing, drawing, use of IT, etc. I like using lapbooks because they are easy to make and useful for revision. Currclick do some readymade, cheap ones that you can download. We did their one on Dickens at Christmas.
Left to his own devices, DS would simply be on his XBox all day, so I am quite strict about sticking to a timetable. Lots of home educators wouldn't dream of doing this. You need to do whatever works for you and your child.
We also go on some trips, but DS suffers a lot from anxiety (which is why he's not in school), so he often finds these hard. But when he can manage it, we go to animal sanctuaries, parks, etc. I also make sure he keeps in touch with old school friends.
Have you found a local home ed group yet? That will be a good source of ideas and support for you, as well as companionship for you and DD. I googled my local area on Yahoo and found a couple of groups that way.
I really hope that you and your daughter soon settle into your new lifestyle. I was much too frantic and worried about it all at the beginning. It took me at least three months to become a bit more laid back.