Hi, I guess you need to decide on what sort of thing you want to create... speakers, amps, .... whatever.
You are right because deciding on what they wish to make is the first step towards deciding the direction that they wish to take. It is after that that they can now decide on learning more about the particular device that they want to assemble. If it is one that requires having a good foundation in physics, then the poster should know if it is one he can do.