I Hope MII Wiki provides lot of information for the starters.
And also if you are already experienced in SAP ABAP and other modules its like more added advantage.
To tell in layman words, MII is a platform which connects to ERP or Plant shopfloor with available connectors and also if needed you can easily integrate any custom development. Its all about java.
There are Java connectors called JCo and JRA for connecting to ERP and Pco for connecting shopfloor.
SCM380 material would help you.
