When I'm asked if duck eggs are edible my standard response is that duck eggs taste like chicken eggs only more so.
I prefer duck eggs. I like to slow scramble them and garnish with tarragon, or have a soft boiled duck egg with toast. My SO prefers his over-medium with a bialy.
The only thing you'll need to account for with duck eggs is size. My ducks smallest eggs are about the size of XL grocery store chicken eggs, so in recipes it's not a 1:1 swap. (For Easter this year I brought my aunt a quiche. She didn't believe me when I told her I only used three eggs in it. Her recipe calls for 5-6!)
As far as refrigeration goes, it's not even really necessary unless you wash the egg. I keep a clean hen house and just scrape off any stuck on pine shavings. Duck eggs have thicker shells and can last longer than chicken eggs generally, I usually recommend use within 30 days, 60 if refrigerated.
She will likely lay for a few years. At least two, though her laying will be influenced by day length. If she's an outdoor duck and you don't have any supplemental hen house lighting then expect her laying to taper down in the fall. If she's a house duck then you're likely turning on lights inside at night and she'll have exposure to the longer photoperiod which will trigger laying.
Let me know if you have any other questions and enjoy your ducks delicious eggs!