Giorgio, you could also watch the Multipart Tutorial on Youtube:
http://www.youtube.com/watch?v=nF0-ZbvjrEw

It gives a nice introduction into the CIVA INS and allowed me to use it without reading much of the manuals. Afterwards however I read all the manuals and was tempted to create additional Tutorials because there are a lot of things not described or slightly wrong described in the Youtoube Video Tutorials. But to get started (also with the DME update), they are fantastic.