You can read about additional options here. Wait until the emulator fully loads, it takes some time.

You can read more about AVD management through GUI and through command line. If you can use GUI, just type in android avd and it will launch the manager, where you can do the same. If you have to use command line for creating your AVD, you can call android create avd -n -t where targetID is the API level you need. I assume that you have built your project and just need to launch it, but you don't have any AVDs created and have to use command line for all the actions.