So everyone is familar with STSADM command prompt and we have all learned to love it. So now we have PowerShell, so to get you started please have a look at the following links which are great resources to get you started for deploying a "WSP" Package using powershell.
There are many more resources available out there - but those are the two I decided to use. You can see the basic commands for deployment below:
ADD-SPSOLUTION [SOLUTION LOCATION]
INSTALL-SPSOLUTION -IDENTITY [SOLUTION NAME] -GACDEPLOYMENT -WEBAPPLICATION [URL]
You can also check out a few MSDN articles:
Hope these articles help you out :-)