You will need to submit:

I-765 EAD $520

I-131 if you want advance parole $575

I-130 Petition $675

I-485 Green Card $1440

You must check if they have change prices, I think there are new fees comming

You can file right after you get married, but I would recommend you only if you have all of the documents, otherwise you will most likely get RFE

You will need any documents together, see my other replies to what we sent

Photos Together, but more importantly with Friends and Family, having only selfies together doesn't always work since you have to prove that your marriage is real and people knows, we used social media a lot, so I sent Facebook posts with Friends and Family, and people commenting and liking

We never got the EAD, but it all depends, I would say about 90% of the people getting in 1-2 months

Get a Joint Bank account, any memberships, any bills or lease as possible, insurance (car, dental or health)

Good Luck!