Have a look at the Training on the My.solidworks site Training | MySolidWorks There are a few free Surfacing videos. Then there will be a opportunity for a subscription service
or SolidProfessor SOLIDWORKS Tutorial | SolidProfessor . SolidProfessor has a trial so you can view before you subscribe.
The key to learning surfacing is to think topologically. Any feature is just a collection of faces. Edges are the intersection of faces.
Start simple. Make a prism from planar surfaces trimmed and knitted together. Make surfaces, chop them up, sew them together.
The fastest way to get up to speed with surfacing is the Surface Modeling course taught by a surfacing expert. Ask your VAR how much real-world surfacing experience the instructor has.
This is one of those courses where having an excellent instructor makes the difference between total confusion and a quick start in mastering SOLIDWORKS.
This is particularly important considering the fundamental changes in how SW generates topology, introduced by 2016. The instructor should be aware of the possible problems and regressions introduced by 2016 and show you possible workarounds.
You can PM me if you have more questions in this regard.