Putting up Flyers, in college, and University boards, are one way.
Another way, will be to get a group to a meeting where you discuss in broad lines, what they can achieve, not only to supply their income, but also as a way to be financial independent later in life
I would also say that what they learn about marketing, will be a good tool, to apply not only in SFI, but in their life in general, and who knows, might even help them with their studies