There are entire books written on how to become a virtual assistant, so this job is definitely worthy of more research. My advice: Focus on one niche (I just hired Lisa Morosky of VA for Bloggers, for instance.) Also, reach out to potential customers directly and let them know what you can do for them instead of hitting up freelance web sites. Finally, you may want to consider resources such as AssistU, which provides training for up-and-coming virtual assistants.
What’s the catch? None, really. Cash back apps act as affiliates for many online merchants, which means that whenever you make a purchase through one of the apps, they get a small commission — but then, they give you a portion of that commission as “cash back”. For example, if I buy a pair of Nike shoes through the Ebates app (or website) and spend $75, Ebates may get a $10 commission but then they’ll pass $7 back to me. It’s basically a way to get sale prices on stuff that isn’t on sale!