As a first step you might post the area where you live. Members who've had good broker experiences can let you know who they trust in your area.
Also any information you can provide on price range, type of boat, type of sailing you intend to do would be helpful.
Best of luck in your search,
95 Catalina 30 Island Time
“If a man is to be obsessed by something, I suppose a boat is as good as anything, perhaps a bit better than most" - E.B. White