Diligence. In this industry, the line between scams and honest businesses is blurry, so you need to do your homework before accepting a position. Call the Better Business Bureau in your area to find out if there have been any complaints filed against the company, and do an online search on their name. Alpine Access is a well-respected company in the field, and Call Center Careers is a great place to look for legitimate call centers looking to hire.
How much will you make? I think my best month with Google AdSense was almost $5,000 over the last ten years. That amazing month blew my mind since it was actually near the beginning of my blogging journey. When you go from making zero to $5,000 in a month, that will rock your world. For me, it also got me even more excited because I knew there were other ways to monetize.