its just a matter of common sense really ill just give you a little information that will get you on your way.
winger - flair, off the ball, technique, dribbling, creativity, first touch, pace and accerleration - types - messi, c ronaldo, andres guardado, steven jovetic, robben, quaresma, joe cole, ribery, cristian rodriguez
Right Midfielder - Crossing, corners, technique, creativity, teamwork, decisions - types - beckham, srna, ashley young, arteta, santana, cristian rodriguez and so on.
Strikers/Foward - off the ball, finishing, composure, decision, pace, accerleration, first touch - types - david villa, torres, henry, eto'o, vucinic, anelka, david trezeguet
Target man - heading, anticipation, jumping, strengh, first touch, balance, off the ball, decisions, teamwork - types - drogba, ibrahimovic, huntelaar, cardozo, seleznyov, berbatov, nistelrooy.
but its really depends what target man you want. to feet/to head/run onto ball and etc.