I would make sure you join the Parents of Children with Type 1 forum http://juvenation.org/groups/parents_of_children_with_type_1/default.aspx
You can read through the posts and replies that will offer lots of suggestions.
Things I wish I would have known, there are probably hundreds, some you just have to learn on your own, but I think the biggest is to make sure your child is a child first, and has diabetes second. Manage the diabetes around the child's life, don't keep her from doing anything she wants to, just figure out a way to handle her D-care. Sometimes that will require that you take a leap of faith in someone else but it is worth it so that your daughter's life is not defined by Diabetes.
Second, remember you are a mother (or a father) NOT a pancreas. There will be times she has numbers that make NO sense. There will be times that you forget to test or forget to give insulin. It is NOT worth getting upset about this. Just recognize it, deal with it and move on.
Third, I had NO IDEA how emotionally challenging having a chronic disease can be before my son's dx. If you haven't already, you will probably grieve for the loss of your daughter's perfect health. THat is healthy and normal. I truly believe it is OK and healthy for your daughter to see you cry and be sad and to be honest that you wish that she didn't have diabetes. I think this has taught my son that is is OK to tell me when he is frustrated or sad about diabetes too. Which hardly ever happens, he is 5; but there are times where it will suck and you will both be in tears. I really think these times are building blocks of trust and an emotional bond that we will need to rely on in the future.
Finally - JUVENATION ROCKS! It is so great to have a safe community of people who really understand what you and your daughter are going thru and where you can come to vent or ask questions or celebrate successes! Cause most of your FB friends really won't think it is AWESOME when your daughter's A1C drops. Welcome!