It's a multi-domain system, and I will need a list of files you've changed or installed (i.e. if you change or create a configuration file please list it for me so I can copy/back up as necessary). That is all the documentation I require.
There is no need for this, please setup tripwire adequately and you will have such list generated for you.
Also, your request has the following flaw: "Your payment will not be based on what you do to set it up". Someone will come wanting these 2 bitcoins so bad and will setup it for you without ever doing it before, and guess what ? You will be able to send emails. The issue is that this person won't setup SPF, DKIM, (and possibly) DMARC and you may/will end up black listed in several providers, will receive more spam than needed, and others that accept your email won't be able to verify its validity.
The "good" thing is that this person wanting these 2 bitcoins so bad might read this reply and will now say he is a professional with 10+ years experience in the area, and will also setup SPF, DKIM, DMARC.