What an excellent question! I am a relative new "duckie". A few things I have learned/observed in my short 1.5 years:
1. PERSONAL investment: They were a surprise gift from hubby (his pIan was for experience, then dinner and done - nice surprise with two female Pekins starting to lay....I got my way to keep them for eggs over the winter

2. Depending on your "want" for the ducks, plan the right breed for you (egg production, pets, noise level, personality, etc.)
3. Ducks are messy!!! It takes mental understanding about that, but still MESSY!!! They LOVE to totally trash clear, clean water in less than 5 seconds!!! Once you "get" it ..you are converted

4. They need water access, more than hydration and they are
COMPLETELY ADVERSE to Clean Water - see above comment
5. Now that I have them accustomed to free range - that is the best!!! SOOOO fun to watch their antics, personalities and crazy happy waddles!. I keep food and pen for safety and they are happy to go into after the day to keep safe. Hubby even sends me funny photos of the ducks

6. IMHO - they need work and attention.....if I was to add up my investment, my eggs would be >$50/doz!!!!! Keep in mind, we are still "setting up". Still love them and not looking this to be a $$$ adventure
7. We now have 8 ducks for winter, in WI (last yr just 2, so MUCH easier!!!). We have purchased a 100 gal. galvanized hog water to be heated and a 300 gallon Rubbermaid tub (dug in) to be heated for a winter water/pond), already determined we need a ramp for some of the ducks to get out

. Hubby working on a "get out of the the best pond EVER" ramp
8. A "hut/coop" is needed for safety as well as training them to lay the eggs in one place (DEFINITELY not fool proof - ugghhhg!!!)
9. An Enclosure (outside of the "house/coop" to ensure they are predator safe is crucial!! i.e. I lock mine in EVERY night and then let them out for free range in the morning
10. ABOVE ALL:::::: Enjoy them and all their crazy personalities

, they are a TOTAL HOOT!!!
11. I have been on the farm my entire life - new to ducks and had
NO IDEA how amazingly GREAT they are!!!! My MIS perception - - "fowl couldn't have personalities". HOW MORE wrong could I have been!!!!