How should I start?

I have 15+ chickens in their coop. 7 rabbits in a separated area/housing. A goat in a large pen.

I want to have ducks! I can't let them free range (I have dogs that free range, hahaha)... I need to decide:

1. What duck breed. I want them for meat, not so much for eggs. I need them to be as quiet as possible and not fly if that's possible.
2. Should I get eggs and incubate or get ducks and let them multiply?
3. Can I keep them w/ my goat ?(she will drink form a nipple waterer and her water won't get dirty). I also clean her pen daily so hosing the pen daily is not an issue for me.
4. I live in a warm/hot tropical climate. Any breeds I should NOT have?

Please your ideas and comments will help a lot! Thanks.