WYCC Under 14 Open IM Wang,R(CAN) Rd4

Here is the game that put IM Richard Wang up to 4-0.

Wang,Richard (2356) - Wu,Christopher (2239) [D30]
WYCC U14 Maribor (4.2), 11.11.2012
This was a tense and far from perfect game. White got a big advantage early and let it slip away. After some tense play, the advantage came back to white and this time there was no mistake as white went over to the attack.

White has an extra pawn but Rf1 and Nd1 are passively placed. How should white play?

White to Play