A mortgage broker is working to get you the loan.
He should be guiding you as far as what paperwork you need. And what you can substitute if necessary. What should be on the paper work, etc.
Shop for a mortgage with banks and brokers for rates and expenses. (Don't give your ss# before you commit to one, although it pays to know your credit score (approx) and shop based on that.)
The more typical your paperwork situation is, the less you may need a broker.