1. Yes, you are delivering electrons, not paper. (Signatures, wet or electronic, are not required by the laws/regs that require you to deliver most of (all?) the loan disclosures.)
2. It's a bad idea to provide one-off e-deliveries of documents required by law/regulation. Instead, your institution should determine if this is a service that's worth the implementation cost, and then go through a full controlled implementation.
3. The procedures for any type of e-delivery are more or less the same. First you provide all the pre-consent disclosures required by ESIGN. Then, you put the customer through a test drive. If the customer demonstrates to you that s/he can receive, open, and read a test document of the type and delivered in the same manner you will use to send the loan disclosures, retain evidence of what you did and then you're good to go.
4. Yes, receive, open, and view--followed by some type of electronic response that includes the customer's statement of consent and proves in some manner (code word, PIN, etc.) that the customer has the savvy to use the e-docs you want to send by email. Simply getting the customer to confirm receipt of the test document is not enough. There must be proof the customer could read the content of the test document.