Welcome to the site. One thing I would be sure to do is get a solid contract with whoever digs the pond (get a pond builder not just someone who moves dirt) who will guarantee that the pond will stay full except for evaporation. Make sure he has knowledge of coring a dam and proper compaction of the soil. If your builder is supplying a dirt man, get a guarantee from him also. If it ain't in writing it is no good. Unfortunately a good ol farmers handshake is no longer to be trusted. Yes, I have a leaking pond. An extra couple of weeks now may save you yrs of problems.
Good luck, take tons of pics and keep us posted.
Read as much as you can in the Pond construction forum.

Do nature a favor, spay/neuter your pets and any weird friends or relatives.