Project Management for Marketing

Hello all - I'm really interested in hearing about marketing teams that employ project managers.  We are considering project managers for campaign and internal projects much like an agency.  We have people with project management experience, just not with using Wrike.  My big questions are: 

1. How do you set up projects with multiple channels and multiple disciplines?  We have writers, designers, digital team members, internal communications, video, and PR for larger scale projects.  

2. Do you arrange project blueprints/templates by tactic (e.g. blog) and then subtask out the copy, design, and placement?  Please share.

3. What is the responsibility of the project manager to report out to account execs and do you use Wrike to manage communications between the two?

Any and all help you can share would be great!  

Andrea