Yes, you can leave the "Acceptance Agent Only" section blank if you’re not using an acceptance agent.
As far as documentation is concerned, you’re correct. See Supporting Documentation Requirements and Additional Documentation Requirements in the Instructions for Form W-7 for more detail.
Copies are acceptable, but they have to be "certified" to the IRS's standards.
According to Supporting Documentation Requirements on page 3 of instructions linked above,
You must submit original documents, or certified copies of these documents from the issuing agency, that support the information provided on Form W-7. A certified copy of a document is one that the original issuing agency provides and certifies as an exact copy of the original document and contains an official stamped seal from the agency. You may be able to request a certified copy of documents at an embassy or consulate.
Please read the entire section in the link above, just so you're clear as to what's acceptable.
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