You've got one of the first ones manufactured - so old that you probably don't enter your extension number, but your mailbox number (1 to 4).
So you're very limited. You want to program your lines to go the Automated Attendant, on either 0 or 2 rings, set your phones to delayed ring, so you don't hear the initial ring, assign the 4 mailboxes to the extensions that need them, and since you don't have separate messages for Day and Night, you need to tailor your greeting to cover both situations.
Grab a Partner ACS manual while you're at the link for Avaya support.
To program the phone system, do it from Ext. 10 or 11.
Feature 00, Left Intercom button Twice will get you into programming mode.
Dial #206-7-01-1, #206-7-02-1, #206-7-03-1, #206-7-04-1 to assign the lines to be answered by the Auto Attendant.
Dial #506-1-01-2, #506-1-02-2, #506-1-03-2, #506-1-04-2, #506-2-01-2, #506-2-02-2, #506-2-03-2, #506-2-04-2 to set it to 2 rings before answering (so that you can capture incoming Caller ID)
Press the Right Hand Intercom button once, dial 10 (for Ext. 10), for each of the lines that are lit up solid green, press them once to toggle to Delayed Ring.
Press the Right Hand Intercom button once again, dial 11 for Ext. 11, do the same, then do it for 12, 13, and 14.
Press Feature 00 to exit.
Press Intercom and dial 777. When VM answers, dial 0 and the password for the System Admin mailbox. Press 3 for the Automated Attendant greeting, 1 to record a new one. Wait for the tone, say something like "Thank you for calling Arizona Roofing, our regular office hours are 8am to 6pm. If you know your party's extension number, please enter it now. Press 2 to request a free estimate, press 3 to speak with a roofing specialist, press 4 to speak with the manager, or pess 0 to speak with operator."
Finally, listen to the options for setting the "Selector Codes", and set 2, 3, and 4 to transfer to the correct extensions.
There is no emergency afterhours options available to you here, as you don't have a different night time message, you don't have outcalling to a cell phone, and the R4 ACS does not have Remote Call Forward.