The duckings will need chick crumbs to eat, you can get special ones for waterfowl but if you use chick crumbs it's essential to get ones without ACS or coccidiostat in them. Smallholder, for example, make chick crumbs without but Farmgate, for example, have ACS in.
I give my ducklings water to play in in a gravel tray (seed tray with no holes) and initially put a 2 flat stones one inside, one out, to make getting in and out easier.
You might want to see how the drake is - watch very closely - but my runner drakes and also my gander make good dads and protected their little families.