Hi, I want my flock to stay healthy, become npip certified, and provide vaccinated ducks to buyers but went to but vaccines and saw that they have like a million. Which ones should I buy? ere should I buy them from? I want a mareks vaccine because of a mareks disease problem I had with my chickens a few years ago. I also want to have as many other Thanks! vaccines I need. I also don't know how to administer them. Do most of them come with instructions? If you guys have any advise I would love to hear it.