Troubles kick-starting Angular 2

Step 1:

>> npm install -g angular-cli

Step 2:

>> ng new newproj2

throws cannot find module exists-sync, object-assign etc.

>> npm install exists-sync && npm install object-assign && npm install minimatch && npm install walk-sync && npm install through

Step3: now works

>> ng new newproj2

When i tried to install some other packages, i kept getting the error

peerinvalid The package @angular/common@2.0.0-rc.3 does not satisfy its siblings’

Did this based on a comment here , to get it to work

>> npm install npm -g