While fairly simple to understand as a concept, finding your actual buyer persona(s) can be a daunting task. You need to figure out which questions are most important to define your buyers. Some questions might include:
What pain point does our product solve for our customers?
What size business is our customer?
What industry do they represent?
What is their title within the organization?
How do they measure success?
When are they most likely to be looking for your products?
Who are they in their free time?
What social media networks do they prefer?
Stick with the basics, then move out from there.