please let me know how to automate work using power shell in SCCM 2012 R2 I am looking some sample scripts for basic start and what are way can we use powershell in SCCM 2012 R2 again scenario is creating package using PowerShell how to automate  

Here you go: https://gallery.technet.microsoft.com/scriptcenter/SCCM-2012-Management-b36e7aeb

I don't want to be unhelpful but you should use a search engine for this. If you have some questions then I'm sure you will get some help.