You can choose the freelancer you'd like to work with by reviewing the proposals they have submitted for your job post. If you're unsure if they qualify for the task you need, you can discuss this with them. You can send them a message requesting more information.
When searching for a Lead Generation Freelancer, many of them provide work samples showing a collection of potential clients for your business.
For my understanding, these are just "prospects" or "potentials" as those names on the list dont know anything about your business and didn't show any interest yet.
What is the best way to find freelancers/Agencies who can deliver real warm (SQL) Leads? Leads who actually have shown some sort of interest in your product?