The general rule of thumb is to study two hours, per unit, per week. Math, science and other difficult courses may require a minimum of 3 hours or more of study for every unit per week. Generally, instructors have their office hours posted on their office door. If you are unable to locate your instructor's office hours, the Dean's office will be able to assist you. All instructors have voice mail.
Many instructors also have an e-mail address.
Normally, instructors include all of this information in their class syllabus. Homework and messages may be turned in to the switchboard staff in the 100 Administration Building. Your materials will be date and time stamped. A method might be to go to a current semester class and talk with currently enrolled students as they enter or leave the classroom. A list of discount services are available in the ASGC Office.