My experience is you don't go out looking for an adviser, they will contact you if you meet their criteria.
This.
My son's advisor works only by referrals. As a college student, and of legal age to sign a contract, it was KEEWARTSON that needed to be comfortable with HIM. I occasionally asked son to ask him some questions for us, but son did all the communicating. As a matter of fact, it was only after the draft that I communicated with the advisor-now-agent with a quick text to thank him for all he did for our son. We have still yet to meet him.
I was advised by a someone in the youth travel baseball business that we probably didn't need an advisor, based on son's projected round. Yet another youth travel baseball coach was the one that referred son. Possibly by having an advisor, he went much higher in the draft than projected.
After meeting some other parents this summer, it seems that many advisor/agents are "friends of the family". We didn't have those kind of friends.
Son began working with his advisor right after Christmas senior year of college. I wish son had had some of his advice during the fall when he first started meeting with scouts and had been advised the proper answers to some of their questions.
In the end, it all worked out nicely.