When you get a new puppy, sit down with it and see exactly how people-oriented it is. Some are obviously incredibly people-oriented from the beginning, and you can run them with your adults right away and not worry about it. You want the party music to go on in all your dogs' heads when they see you. You can do a lot worse than watching Sylvia and trying to be exactly like her, voice, body language, and all. Janice DeMello's program is very good for people who have no natural ability to inspire dog attention.
Style is more than just flow.
Class might also be a suitable word. Getting some coaching would be one approach to attaining style. We are very lucky in Agility in that we can actually get hands on experience with the top people. You could spend a fortune on seminars with the top handlers and not achieve as much as you should unless you approach it in the right manner. What I am going to suggest is not a substitute for attending the right seminars where you can have your style analyzed by an expert, but it is a lot cheaper and might provide you with insights that you would miss otherwise.