你最好面对面地跟老师谈谈以便征求一下他的意见

You had better (have a) talk with your teacher face to face in order to take her advice.=You had better( have a )talk with your teacher face to face in order to take some advice from her.=You had better (have a) talk with your teacher face to face in order that you can/may take some advice from her.

(have a) talk with sb. "和。。。谈话"
face to face "面对面"
take (one's) advice "征求（某人的）意见"