Early-stage advisors - what works & doesn't?

Fellow founders: I've been thinking about the advisor relationship for my new company and would love to get a sense of how you've leveraged advisor relationships and what you would do differently if you could...-When did you bring on your first advisors?-Who are they (successful founders or expert operators, i.e. sales or ops)?-How did you find the right people?-What would you change if you could?-Is it better to have the same couple advisors for years, or bring in new people regularly? I'm curious about how advisors change as company needs change.I'd definitely put advisors in the category of "you get what you put in," so I want to approach the process strategically and would love to learn from those who have done it before. I understand the mechanics of equity, vesting schedules, etc. but am less clear on recruitment and making the most of the relationship. Thanks!