EEA FAMILY PERMIT where and how

Can anyone please tell me as I am struggling here and panicking.
Can I submit all documents ? As they go to Sheffield anyway. I am not sure if my wife needs to send docs there and me my part here. Or all the docs should be submitted by one person.
She has been advised to send all to me so I can submit.
Is it true?
I'm guessing she'd still have fill application
Book appointment and submit her passport somehow?

I am Polish living In UK
My wife is Chinese. Married In February2018

How to arrange all documents? 
I have so far:
2-3 month bank statements (recent ones though with overdraft used to maximum 2,5k:( )
Half a year pay slips
Statement from employer(more than 5 years for same)
I can provide some cards she sent me with wishes
Photos from our travels together
I can provide a statement from my mum she has met and known my wife for 5 years
We can write our love stories of our relationship how it evolved
I could try to print some records from wechat (Chinese equivalent of messenger)

What else should I require to avoid infamous 
Minor inadequacies?


We would plan to bring her to UK by our anniversary 24/02 Or definitely by the Brexit.
I'm planning to go to China to pick her and travel together
I'm in UK all the time by the way

I'd appreciate precise answer 
If You can recommend any lawyer or agent in Edinburgh or Glasgow area I'd appreciate that too

I live in UK and she lives in china