Hi nepalionline, first thing for you to do is, get your qualification accredited from Engineers Australia, ( www.engineersaustralia.org.au ) once u got positive assessment, you process your application. details here; 
  http://www.immi.gov.au/skilled/general-skilled-migration/visa-options-outside.htm

For people looking for job this is aus's number 1. 
  www.seek.com.au   

( but companies don't sponsor while you are still oversea, so you must have PR or some sort of work visa)).

Hope that helps.