Don't stress

it will be fun. Check out the Duck articles.
https://www.backyardchickens.com/articles/category/ducks.30/
Also check out the ducks' sticky topics.
https://www.backyardchickens.com/threads/ducks-sticky-topics-index.256233/
At this age, you can probably use a desk lamp or something similar with a 100w bulb for warmth. Position it at one end of their box so they can choose to either go to the warm spot or move away from it. If they hang out under the light all the time it means they are too cold, if they always stay at the far end of the box away from the light it means they are too hot, you can re-position the light or use a different watt bulb accordingly.
Go to the store and see if they have a waterfowl feed or Purina Flock Raiser or an un-medicated chick starter. They can have un-medicated chick starter until about 8 weeks or Flock Raiser from duckling through adulthood. Also pick up a bag of "chick grit."
Also see if you can buy brewer's yeast or nutritional yeast at your grocery store for additional niacin. Ducklings grow super fast so their nutritional needs are different than baby chickens, so this is something you should add into their feed especially if they are eating a chick feed.
A water dish they can dunk their heads in is good. If you do a google image search for "no mess duckling water" you will get some ideas of DIY ways to build a good water dish they can't easily swim and and will keep things cleaner in their brooder. You should be able to make something out of things you have at home. Actually, if you have the lid to the container in your picture, you can put that on and cut a hole big enough they can put their heads in to drink, but not so big they can get their whole body through.
Your blue might be a blue swedish, it doesn't seem tall like a runner in your photos, but it's hard for me to tell if it might get the white bib... hmm...
Keep reading, keep asking questions. Raising ducklings doesn't have to be difficult. Also it's not too late for them to get used to people and be friendly. Just be calm around them. Talk to them before you get close so they can hear you coming since they probably can't see you coming through their box. This way they will learn your voice and learn not to be scared of your approach. Be gentle with them. They will be just fine.
Good luck!