Prioritize your list from “most helpful or promising or aligned with your goal” to “least” (by guessing); the prioritization may shift over time.
Don't get too hung up on this process. Simply look at your list of people and opportunities and try to figure out who or which one is most likely to get you where you want to go.
Re-prioritize your list often; maybe even every day. Each time you finish talking with someone, you'll probably want to move them down your list a bit and move others up.
Also keep in mind that people closest to your own age may have different advice than people who are a lot older or younger than you. It's all valuable, so try to contact a wide variety of people. Be careful about taking advice from people who are not working (and often have the most time to help).
Disclaimer: I am no longer working, but know many who are and can introduce you to them.