definitely find a pro.

That is the best advice that any of us professionals could possibly give.

If you were right in front of me, I would tell you I would have to walk the house with you (or the plans if it's not built yet), spend a couple of hours discussing options with you, and then a couple of hours, probably more, coming up with the overall plan. This should not be done for free. Anybody who does this for free is so desperate for work that they might overlook anything that would keep them from doing the job properly (I once worked for such a guy and had to design solutions on the job, which always cost the client more money).

But you're not in front of me, making any real advice impossible. The best thing I've seen here is the idea of $60 to $100k. While that seems like a really wide range, it's an indication of just how bad an idea it is to ask somebody who can't see the house about such a huge project.