RE: Duck or Goose Jerkey??
The first secret to making good duck is making it taste like something other than duck. The second secret is making it smaller. Jerky accomplishes both.
Slice breast lengthwise against grain very thinly. This allows marinade to penetrate fully and to dehydrate thoroughly. Use a thin marinade that will soak in. Thicker ones will just coat the outside. Start with what you currently use for beef and adjust ingredients to your taste.