I think you'll see we aren't going to rest until we get you to measure that dang pond and figure out the gallons. There's no point in buying a pump until we get that measurement.
Also, how many feet is it from where the pump will be situated to your pond? We'll need to calculate that in for head/friction. And is it a straight up vertical shot from your basement or is there an angle?
Don't be confused....let's just start at the basics. Give us your measurements and answer the question about head height, and we'll get you off to the right start.