To answer your questions:
1. No change should be necessary because Session.UserName should be your user name. Verify this by stepping through the code in the debugger.
2 and 3. In your posted code the Attachment variable is a string containing the full path and filename of an attachment, so this is the part you need to change. You'll also need to specify a unique rich text item name for each attached file. For example:
Set AttachME = MailDoc.CREATERICHTEXTITEM("Attachment1")
Set EmbedObj = AttachME.EMBEDOBJECT(1454, "", "C:\file.jpg", "Attachment")
Set AttachME = MailDoc.CREATERICHTEXTITEM("Attachment2")
Set EmbedObj = AttachME.EMBEDOBJECT(1454, "", "C:\file.pdf", "Attachment")
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