Surface Modelling Beginner

Hi,

I am new to the concept of  surface modelling and I'm struggling to find any training material that demonstrates how the tools can be used in a practical application.

So far I've been through the Bentley learning videos for surface modelling and played around a little but I'm still not sure about what I'm doing.

I've been looking at the plumbing fixtures that are in the default library and I would like to know how I can draw, for example, a kitchen sink.

Any help or advice is appreciated.