Tree House fund

Lee here...Annie has been saving some of her allowance and her pay from getting her grandparents groceries and we have put in some of our spare change....she has over $200. So, its been put off for far too long....must get started on her treehouse. The problem is, we are not at all handy and I have no idea where to start...I'm completely overwhelmed. Something that should be fun is one of those things I've been putting off and Annie is worried we will never do it. I don't blame her for being concerned! I want it to be what she wants and safe and it needs to be started and finished within a reasonable amount of time. Wish me luck!