Get permission for your campus ministry in your job description. Few job descriptions include campus ministry. Work with your church leadership to agree on a percentage of time each week you are on campus. Because few people understand campus ministry, having a job description that requires you to be there will help. Determine a minimum response from students that will make your ministry successful.
Campus ministry is hard and takes time.
Always have an objective criteria that helps you evaluate if you efforts are fruitful or if you need to change tactics. Understand why you are going. Your contribution must bring a difference to lives. Usually, simply hanging out makes little difference. Be specific in what you want to accomplish.