I have an off$3.5 million high margin service business I found with three partners that all own the business...

Step one... speak on the phone with one of them and have a friendly conversation about him personally and surface level talk about the business. ( already done)

Step two... meet with the other partner in person over lunch and do the same thing.

Step three... have a zoom call with all three and start the closing process. The first two will vouch for me as someone that can be trusted especially from the in person meeting I had.