When you move to a island, Nook’s Cranny isn’t open, you should do something to unlock and build Nook’s Cranny. And after unlock it, you need to upgrade Nook's Cranny.

 
 

How to build Nook’s Cranny
In order to unlock Nook’s Cranny, you’ll have a couple of days work after moving to the island. You’ll first need to pay off your Island Getaway Package by earning 5,000 Nook Miles, and then upgrade your tent to a house by talking to Tom Nook. The next day, once your house has been built, entering Resident Services tent will see Tom Nook and Timmy deep in conversation. It’s now up to Timmy to figure out how to build Nook’s Cranny, and he’ll turn to you to help collect resources. You’ll need to bring him 30 Wood, 30 Hardwood, 30 Softwood, which can all be obtained by hitting trees with an axe, and 30 Iron Nuggets, which you’ll get from hitting the rocks on your island. Learn how to repeatedly hit rocks to get up to eight resources from them and go on island tours using Nook Miles Tickets to gather extra resources. Once you’ve been able to hand Timmy all of those resources, he’ll let you place the build site for Nook’s Cranny and it’ll open the next day.
 
Benefits & Perks Of The Upgraded Nook’s Cranny
The upgraded and expanded version of Nook’s Cranny offers a number of benefits over the original version, not to mention the greatly improved aesthetic! Whereas the initial building looks a bit run down, the upgraded shop has a more stylish look and features new music.
 
How to upgrade Nook’s Cranny
The first upgraded version of Nook’s Cranny will feature more items for sale each day, as well as an expanded cabinet with custom tools for sale. In order to upgrade Nook’s Cranny, you’ll have to do quite a bit of spending at the store to trigger the building’s upgrade - and you may need to upgrade Resident Services to a building first. We spent around 70,000 bells buying items from Nook’s Cranny before the upgrade triggered - but note that there may be additional parameters in days spent on the island, the state of your house and the Resident Services building. Once all requirements have been met, Timmy and Tommy will inform you that they’ll be upgrading their store! The following day, Nook’s Cranny will be unavailable as it is undergoing construction. After that, you have a bigger and better store that can offer more merchandise to you!
 
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