Bullhead, that's a great start. Keep fishing and keep records of every fish you catch! Accurate numbers, length and if you got a scale weigh them too. Then you can work out their WR.

The easiest way to tell black and white crappie apart is count the dorsal spines. 6 spines, its a white; 7 or 8 spines, its a black.

Your pond may not have any catfish spawning structure so the catfish stocking of years past may no longer be present do to natural mortality with no recruitment.

Keep polishing the gem you have!