Like, you will send the service request form including your profile and budget, to the experts and then the experts will see your budget and customize the marketing methods and etc. Afterwards, the experts send a customized plan/proposal to the you. And you will decide who you'll work with.

Oh, Actually the promotion service is available to all users, it doesn't require the premium subscription.

I think you have to subscribe to the premium service to get access to experts who will help you with your promotions.