About marketing plan :The plan include Product,Price,Promotion,Place.They mix the quality,design,pavkaging,services,advertising,public relations,pomotion channels,inventory,and so on,so many things mix in the marketing plan,face a great deal of works,you must keep a cool head and good work skills.

As to major responsibilities: 1,Defines product positioning. 2,Develop product presentations and sales tools,find the best pomotion channels. 3,Co-ordinates company and marketing,customer feedback with project and customer services solutions.you may have to deal with many different projects at the same time,so you must have the decent speciality knowledge.

The others:you shoult possess good spoken and written communication skills,this is can let you become better.