Need Info on Johannesburg city & job search

Dear Fellow Expats

Please help me in getting few information if possible, Iam planning to move to Johannesburg in the month of march Protected content would like to know if there is any website / concept of room mates finder / apartment sharing and how much does it cost for average monthly rentals. Also please let me know how to go for a interview lined up / job search for IT related jobs, as Iam currently IT Infrastructure professional working in Kabul.

Thanks