EddieWalker I believe is correct ...... I know people who have 30+ acre lakes on their property by damning up creeks that do not originate on their property; I believe there is a size restriction but I can't tell you want that is - Off the top of my head I think its base on acre size such as "anything over 20ac requires a state licensed engineer".
I'm in the planning process now for improving 3 ponds that are 1ac+/- each, on my place and as someone who does excavation work for a living I can tell you that EddieWalker is right about the vegetative bench as well; the steeper you can make the banks the better it is to control vegetation. If the water gets deep quick then the plants cant root in the ground and get sunlight.
1. If you have a tree that is large and standing where you want a brush pile; the dozer operator should simply push it over, leaving the root ball partially attached to the ground to act as an anchor and then pile the brush on top of it.
2. Sometimes people want MASSIVE brush piles - I prefer multiple smaller ones spread out and at different depths so the fish have retreat zones if the water levels drops extremely low.
3. I would pump it DRY and well before having the work done, it will make the work a lot easier and you can start fresh with good genetics and really raise up a massive baitfish population before ever re-introducing bass.
4. Working / shore area..... If your going to intensively manage the pond then its always nice to have a gravel ramp/working area that extends out of the water on the bank that slopes gently enough to both launch small boats or back a truck up to. Start with having a base of 3x5"(fist size) rock put down as a base then cover with 3/4"
5. SOIL & water tests!- Go on youtube and see how to take the samples and send them off for testing; this will help you get the most out of your pond without throwing money away on things you don't need..... Such as liming- balancing the PH of your pond can yield big dividends for not much money; and its ALOT easier to lime a pond when its newly constructed and dry than when its full. If you need lime, just have it delivered and dumped just before the equipment work is done and have the equipment operators mix it into the ponds soil.
6. Dock & Aeration - Looks like you got a house fairly close, so let me ask you this..... if your going to spend the money to enlarge the pond, then why not run power to it to have a lighted dock and aeration system? If its not in the current budget to build a dock or put in an aeration system that's fine, but it can always be done at a later date - Also the aeration system would keep the pond surface from freezing in winter if it gets that cold ducks will be looking hard for open water to land in. Not to mention keeping your pond from stratifying and allowing the full water column to be utilized and reduce stress on fish during low water conditions.
7. Fertilizing vs. Feeding - If you want to take your pond to the max you could either fertilize it or put a fish feeder out..... BUT NOT BOTH!
Fertilizing if usually overlooked for ponds but it can really make the different and can be quite cost effective compared to having a fish feeder running; check out this video
https://www.youtube.com/watch?v=bT3xPD1y6Hg