I can't help, but I can say good luck. I started trying to use Marc 2005 about one year ago. Coming from Mechanica and or Ansys Workbench I knew I was in for a learning curve. Little did I know how tough it would be. The documentation for Marc is VERY poor in my mind. For example, clicking on help for commands like RBE2 gives help like "use this to define an RBE2". Well no sh*%. I was hoping for some detailed explanation, maybe even an example.
Marc seems immensely powerful but poorly documented and assumes you are a PhD. Poor marketing on MSC's part. I am a "lowly" engineer so I find it frustrating to work with. Having said that, I just email their tech support with a whole lot of questions and they are very good.