a start point of a new Android development project

This is a start point of a new Android development project.
I just got a new Android machine with LAN and RS232 port.
Now I need to install the Android development environment.
First, I downloaded the ADT (Android Development Tools) from Google Site:
    http://developer.android.com/tools/sdk/eclipse-adt.html
And put it into one directory on my PC.
Double clicked the eclipse.exe under the "adt dir\eclips" directory, then I started a new Android project as follows:

-Click Eclipse.
-File>New>Project>...Select Android>Android Project, click Next.
-Key in HelloWorld, and Next, Next, Next, Next, Finish.
-Right Click HelloWorld>Run As>Android Application.
-Click Yes.
-Click New.
-Select Device.
-Key In AVD Name, then click OK.

I could see it was running!
The simulator was launched!
The app was running.