As a college senior and probably a business or marketing major, this is a question that sounds like it is directed towards specific class or textbook information, so keep that in mind as you read my answer, and tailor it to fit what your instructor wants.
Step 1: Set objectives for the campaign. Do you want to increase sales? Brand recognition? Public good will?
Step 2: Identify a market demographic for the campaign - at which population will this campaign be aimed at?
Step 3: Plan to coordinate your marketing campaign with other events and efforts, such as sales, holidays and other marketing efforts in different media
Step 4: Develop a specific marketing plan. Which media will you use? How will your dollars be most cost effectively spent? When will the timing of the campaign take place?
Step 5: Implement measures and strategies that can accurately track the success/results of your campaign.
Step 6: Evaluate successes and flaws and make adjustments to future plans.