Man United team

This is the team that I use:
I use the asymmetric formation
GK: De Gea

RB: Rafael/Smalling
CB: Vidic/Hummels
CB: Ferdinand/Jones
LB: Evra/Fabio

DMC: Fellaini/Hummels
MC: Khedira/Fletcher
MR: Valencia
AML:Nani/Ashley Young
AMC: Gotze/Giggs

ST: Hernandez/Rooney

OTHER PLAYERS:
GOURCUFF

I NEED HELP WITH THE FORMATION. PLAYER ROLES, GOOD DEFENCE AND HOW TO GET THE BEST OUT OF GOTZE?

Use Gotze as AML inside forward, and train him to place shots. Putting him on a finishing training would be useful too

Thank you so what about Nani?

Nani is good because he can rotate, but I'd use him either MR or AMR, if you want as an AMC