Hello,
At this time SMM for SCCM is supported on SCCM 2007 only. An upcoming release will add support for SCCM 2012.
You can find the correct installation order in the Installation guide located here:
http://www.symantec.com/docs/DOC6082
The following is the proper order of installation in a Configuration Manager environment.
1. Internet-Facing Server
a. Push Services
2. Central Server
a. Console
b. ISV Proxy (first time only)
c. Services
d. Reporting Services
e. Feature Packs (optional)
f. Replication Services
3. Primary Server
a. Console
b. Services
c. Feature Packs (optional)
4. Secondary Server
a. Console (optional)
b. Services
Don't install anything on any servers other than what is specified in the instructions.
I am attaching a LAB Guide as a reference. The guide will have information about setting up a test environment and can be used as a reference but should be adapted for your environment.
Authentication is used to enroll the devices into the system. When AD is used the credentials are pushed to the devices when configuring the email setup and potentially for any other configurations that require authentication.
The Authentication also associates the devices to those users. If a user has multiple devices you will then be able to see all of the associated devices for that person.