How to design a model in Solidworks using surface

Hello,
There's a problem I have with surface in solidworks.
I want co create a body for a motorcycle - like in the photo attached, and I have designed a model- like in the photo; I have managed to create some models, but the real problem I have, I think, is the way of thinking with creating surfaces.
Are there some steps you have to follow to reach a good design?
What features are more useful to create a surface model like described
Like an architect said to me - the real deal with a good design is the way of thinking in creating that good design.
I have seen many tutorials and it really helped me but I still have some difficulties in having surfaces continuity.
The 3d models designed are in my projects, maybe that can help.
Thank's