I am new to ducks as well. I have only had mine for 10 weeks, but I have had chickens for over a year.
These are the things I would reccomend:
Rubber Gloves--- For checking the vent, on an eggbound chicken.
Preperation H.--- For a duck that is egg-bound; This has already been mentioned but I feel that it is important.
Vaseline --- For the eggbound chicken, lubricates the glove.
Epson Salt--- Used in warm bath water to help eggbound chicken relax their abdomen.
Calcium Pills--- Calcium pills can be crushed up and mixed with water, or you can get gel caps and cut them to get the liquid out and syringe it to the duck. Calcium helps an eggbound duck pass an egg easier.
Sryinges--- For syringing sick ducks.
Poly-Vi-Sol--- For a duckling that has a vitamin deficiency which can cause Wry Neck Sydrome.
Antibitoic powder--- For a sick duck(ling).
Pedialyte--- To keep a sick duck hydrated. This can be sryinged, or mixed in with the drinking water.
Vet Rx--- a natural remedy that helps ducks that sound congested. This can be syringed, or mixed in with the drinking water.
Extra heat lamp bulbs--- incase your bulb goes out.
Storey's Guide to Raising Ducks, it is a life saver!
This is a great idea! Kudos to you!