Star Rating has an extensive write up here.....
http://manual.b2evolution.net/Plugins/starrating_plugin
And Sticky announcement is well documented here....
http://www.balupton.com/blogs/b2evo?title=sticky_announcements_plugin&more=1&c=1&tb=1&pb=1

It would help if you could post what version of B2 your using as some plugins may not be compatible .

Cheers