Text (8th+errata): Search target opponent's library for a creature card and put that card onto the battlefield under your control. Then that player shuffles his or her library. [Oracle 2009/07/08]
You put the creature into play, so you control it and any "comes into play" abilities it has. [MM FAQ 1999/09/22]
You do not have to find a creature card if you do not want to. See Rule 701.14. [D'Angelo 2001/07/14]