Don't discount the importance of professional behavior when honing your interview and job skills. The way you conduct yourself during an interview, as an intern, and on the job can make the difference in how well you come across, how well you fit in, and how far you go in your chosen profession. Once on the job, you can take cues from the behavior of your peers, and you can ask, when uncertain, about the practices unique to your employment situation. But until then, make sure you're well versed in basic business etiquette. Adopting these conventions as your own will facilitate your transition into the working world and mark you as a professional. 

Standard Tips 

• Be punctual for interviews, meetings, and especially the first day. Timeliness is expected, and should be considered mandatory 
• Notify your employer as soon as possible if you will be late or absent from work. 
• Dress appropriately. When in doubt, dress for business: suit, dress, shirt and tie, etc. You can always dress down later or as office policy dictates. 
• Use appropriate language, which typically does not include slang -- and never includes profanity. 
• Be courteous and considerate. Use proper forms of address; knock before entering someone's office; thank people when they assist you, no matter how menial the task; and say "excuse me" when you absolutely must take a call in someone's presence. 
• Return calls and requests for information promptly, within 24 hours at a maximum. 

• Keep personal business to a minimum by limiting personal conversations, calls, and visits during working hours. 
• Respect the chain of command. Use the proper channels to take an issue to a higher level. Don't go over or around another employee to their supervisor or manager, speak with your own supervisor or manager instead. 
• Give two weeks notice via memo when you plan to leave. Continue to conduct yourself in a professional manner throughout the full two-week period. Education, skills, and experience can help you get a job. A professional manner can help you succeed.