Welcome to Pond Boss edew. Get some pond builders out there to look at it. Can't hurt for the advice. You can start weeding thru some of them to which ones know what their talking about.
I had some come out for my pond. Most gave a ball park idea of price, but they all said it if it was drained they could be more accurate in price. However, all of the ones that came out, none had a good idea of pond building, at least they didn't give me an indication of that anyway. But each one gave a bit of advice that was used and compiled in the end product. I wouldn't physically do anything until you get some basic prices. You might drain it, and then realize it's not in your budget for years (or at all). During which time you could have been enjoying it "as is".
Do lots of research here, that never hurts. Ask lots of questions.
