This post briefly lists the step you must do to start coding an Aurelia powered app. for the long story go to Aurelia Get started page.
install node or update to the latest version. this step is important.
install gulp globaly :
npm install -g gulp
install jspm globaly:
npm install -g jspm
configure jspm with github credentials : (follow instructions)
jspm registry config github
download the skeleton app : https://github.com/aurelia/skeleton-navigation/releases and extract it to a folder of your choice
navigate to the root of the app :
cd C:\_temp\GitHub\aurelia-playground\skeleton-navigation-0.12.0
launch npm and jspm install
npm install jspm install -y
launch the command to start a webserver that listens on : http://localhost:9000/
gulp watch
12/04/2015 : tested with v0.12