I already have the major software installed on my Windows machine from my last Eclipse build, detailed in https://iphonedevlog.wordpress.com/2012/11/20/building-a-phonegap-android-app-on-windows-cordova-2-2-0-with-eclipse/. If this is your first time with Eclipse and PhoneGap, follow the link above and pay careful attention to the following setup sections:
Install Eclipse Juno IDE
Install Java JDK
Install the Android SDK
Android SDK Manager
Set up your PATH environment variables
The steps following will take up where these left off.