Get to know the people you'll be working with. Like an interview for an open position, schedule a call with your new (potential) agency partner. Bring some important questions to help you decide.

Reputable agencies are proud of their recent work. Like you're doing now, take a look at their services and portfolio to learn their capabilities and gauge their creativity. You should see some work that you like!

A good creative agency may have its own specialization but should have a wide enough background to be able to advise you on all the services you require. You should be confident in their ability to be creative problem solvers and competent advisors to your marketing efforts.