Advice for new Marketing Liason?

I am currently working for a small consulting firm that is growing at breaknecking speed. Our leadership team recently realized our need for a marketing plan so we hired a local adveriting/marketing company to outsource our marketing tasks for now. I was hired as sales support and administrative assistance to our president and will now also be the liason between my company and the marketing company. As a recent college graduate I am new to this field and would love any advice or resource suggestions that will help prepare me for this new role. As a new basic member to Demand Metric I would love to present a compelling case to my supervisor to upgrade my membership. Any tools or resources you have used that stand out would be greatly appreciated.