Wow, you are going to make a HUGE change in what that pond looked like before. You will get lots of help from here, for sure. You could even keep this as your thread, or change it to another thread. Be sure to let us all know where you "went" so we can follow. I can't wait to see what you create.
BTW, where are you located? I'd be happy to help you out with some plants. I have lots of colors of water lilies that need to be divided, and if you have a shallow area (I see you do, but not sure if you plan to plant it ...) I have lots of kinds of bog plants, too. Always happy to help out a school, if you're in a zone similar to my Illinois Zone 6 ... or is it 5a or something new now ...
