How many do you suggest I stock and remove each year?
As Bill Cody says, "it depends".
If it was my pond, I'd make sure that I stocked the same number of fish or very close to the same number of fish that I removed every year.
That removal number is strictly up to you. Only you can decide how many to stock, because the # of fish depend on what each one weighs. What each fish weighs at stocking all depends on your patience and pocketbook. If you're a patient person, you can stock smaller ones and let them grow. Just don't put more fish in the pond than it can carry (see carrying capacity in the archives for a more detailed definition).