How can we use store in Ember 2.x

I am upgrading my app from Ember 1.10 to 2.2. I have used store in 1.10 and is working fine there, but when I try to copy that in 2.2, it gives me error because of store. Is there a specific way to initialize the store as I am not able to get the store all the time. In some controllers, not all the data of the store is available. Please help