Jamie welcome to the forum, it sounds like you have a good shot at keeping trout, in addition to Cecil's info you might put in an electric fence around the pond if you think otters will be a problem.
With a small pond it wouldn't cost much and since the fence only needs to be a foot high it's not really an obstruction for people. I've had mine for more than 3 years and it does the job, they learn fast to go to greener pastures when they get their nose zapped.
