One way of building a dream team is to offer a certain percentage on equity. Depending on your business details, such as amount of sales, profits, potential growth etc you can offer a certain percentage. You could approach team members based upon their expertise and to seek their professional advice. Make this clear that you're seeking their expertise, since most professionals want to offer their professional expertise. Dan Pena who is a business coach suggests to offer 2% of your equity. Given in too much away too quick may not be wise.

You can make a list of professionals that you can potentially reach out to and then move forwards depending upon the responses you get.