Once downloaded Liferay Development Configurator, just unzip it and run this at a command line to see all available options:
java -jar LiferayDevelopmentConfigurator.jar --help
If you want to quickly start configuring your development environment, just customize the [configuration.properties] file and run this:
java -jar LiferayDevelopmentConfigurator.jar --project ProjectName --version 6.2.3
Liferay Development Configurator will create all the needed folders, download all the needed files (SDK, Tomcat bundle, ...) and start Eclipse on your brand new workspace.
All the download files will be stored on your file system, so you don't need to download them every time.
Liferay Development Configurator only support 6.1.1+ versions and only the Community Edition:
You need Java 7 (or above) to run Liferay Development Configurator.