This is somewhat dated self-paced training material that we created in 2011. However the underlying principles of how the software works are essentially the same. In the newer versions of MAXSURF you will find an updated user interface and many new commands, so there are possibly alternative ways of doing things these days.
This training material will give you a good introduction to modelling with NURB surfaces in MAXSURF Modeler. It contains a pdf document which takes you through the various steps and also some short video clips which demonstrate the various topics described in the text.
Don't forget that there are also many instructional videos on our You-Tube channel: Bentley Offshore Analysis - YouTube