Kudos on a great start!
One of my simple joys is to look at a piece of land and imagine how I would work with it. Each piece is different and each piece changes while you're looking and working it.
One thing I've learned is to be patient. I can't list how many "good ideas" I've had that I am so thankful I never acted on. This is especially true with earth works, like digging a pond. It requires much consideration from many points of view.

I've got a small creek on my property that I REALLY want to back up into a small pond that I need to excavate. I would not divert the creek, just flow it into and out of the as yet non-existent pond. Originally I was thinking BIG, but with more thought I've scaled back the size of the pond. I'm sure it will change a lot more before the excavator goes to work.
Keep us posted on your lessons learned; they're what's important.