An advisor would advise you around "How to do" than "What to do". What to do is something that requires collective thinking, advisor included. You can't expect an advisor to help you with anything and everything i.e. VC (Investment). Marketing Strategy (Brand & Sales), and Overall Execution (Everything & Anything). Know that you're looking for an advisor, not establishing departments around one employee.

As far as equity stake is concerned, there's no rule of thumb for that and depends upon your business idea, risk involved with the same, and other critical parameters.