Hi,
Various sources of recruiting include:
1. Database search
2. Job portals
3. References
4. Employer search
5. Headhunting
6. Advertising, etc.
While validating, you have to probe them properly by asking questions like:
1. Why are you looking for a change in your job?
2. What is your work profile?
3. Are you okay with relocation if the position is in another state?
4. If needed, you can ask, "Can I know how much you are currently earning?"
5. Depending on their response, you have to judge whether they are serious about changing their job or not.
6. If it involves shifts, you can ask, "Are you okay with shifts?"
7. Questions also depend on the domains, such as BPO, software, FMCG, manufacturing, telecom, etc.
Thanks