How do I ask for an informational chat?, software tester here

I want to talk to people in a new field but I hate cold messages. I have been trying to stay organised about it. I worry about bothering people. How do you phrase the request?

Follow up with a thank-you and a short update. One of my chats led to a referral a month later.

I asked what they wish they had known at my stage. People enjoy answering that.