If you opened AppGameKit using the link created on your desktop, then you are using the AppGameKit IDE and that is Tier 1. The language in Tier 1 is a Basic variant.
There are plenty of examples in Basic provided showing how to do lots of stuff.
You can also use the IDE to create a brand new project. From the menu select File->New->Project and work through the steps presented. That creates a nice clean "hello world" app.
As for executing on your phone. Is it an Android or iPhone? If it is an Android (good guess based on this forum section), you can load the appropriate version of the Player
from this page directly onto your phone. Then you can broadcast your app from the IDE, assuming that your phone sees the same network as your computer and that you have a wireless network.
As for compiling and running on your phone directly. Well, if you don't know enough to know if you are using Basic or C++, then you aren't ready yet to set up your computer for compiling for an Android device.
EDIT: That last is not meant to be sarcastic or nasty, just a basic response to what appeared to be a lack of understanding of some simple stuff.
Cheers,
Ancient Lady
AGK Community Tester