Congrats on the purchase..also be careful. Sharing a pond can be a slippery slope. You may have your plan on what should be in it they may have others. Or their good old uncle Joey might catch a bunch of "bluegill" and think he's doing a favor and dump them in. Turns out they weren't what he thought they were. Neighbors come and go so it can change at any moment. That being said fishing and trapping should get you started to figuring out what's in there. Whats the depth..is there fish structure...is it aerated? Just preparing you for the questions you'll be asked. Good luck