This was even easier.

Once you have enabled Windows Intune for Mobile Device Management its easy.

Step 1:

Connect your Windows RT Device to Windows Intune by clicking Start -> Type Company Apps -> Click Settings – > Enter your User Name and Password

Step 2:

Download the Company Portal App from Market Place. Once installed, start it and click “Enroll this device”

 

To distribute apps you need a sideloading key.

See this blog for sideloading

http://richfrombechtle.wordpress.com/2012/10/23/windows-8-enterprise-sideloading-keys/

And/or this technet article for reference
http://technet.microsoft.com/en-us/library/hh852635.aspx