When you are in Android, click Tools โ Android โ AVD Manager. This will lead you to a screen where you can manage your virtual devices.
Then click the Create virtual device button in the lower left corner of the window that opens.
Then you will see a list of all types of devices that you can create.
That's where I think you got lost ...
In the left part of this window you will see a menu of various types of devices that you can create - a TV, a carry, a phone and a tablet.
Click the โTabletโ button and you will see a list of different tablets that you can emulate. Nexus 9 will be one of them.
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