The caller is more important than the call. Practice with someone who knows calling or listen to a lot of videos, CDs, etc that have good calling.
For a new caller, I think good basic quacks, feed call, etc. are MUCH better than that long high-ball that competition callers use.
Listen to ducks on a pond. Mimic what they do. Odds are you will not hear a screaming high ball come out of them.....
