Well done!
Planning is absolutely the most important aspect of creating a lake.
20 years from now, you will look back and easily see planning, by far, to be your best overall decision.
You will be able to alter your fish, change the water chemistry, aerate...all those management things.
But, if the pond ain't built right at the start, your headaches could have been overwhelming.
It all starts and ends with solid planning. Planning affects you financially, as well as biologically.
Good job, keep us posted.
Take photos.

Teach a man to grow fish...
He can teach to catch fish...