What sites are recommended to start scambaiting?
This site and Youtube will likely be your best. Are you looking for how to obtain numbers?
If you want something to call scammers. You can use google hangouts, Textnow, and FireRTC (You can’t sign up for it right now though). You can use this site to find numbers and to teach you how to find your own numbers. You can go on Youtube for inspiration and whatnot. That’s about it.