Do not start writing the resume until you have any idea about the employer. Also, you should remember this important point: you need to show the employers what you can benefit them but not what you may benefit from them. The perfect resume must focus on the strength in necessary experience and skills that the employer may require from you. You will score more point with your knowledge about the employers and understanding of what they expect from you.
Find out about the employers: Do not let your resume or resume in disorder or write a resume or resume in a certain available form. Resume and resume are one way to show off your personality and make the best explanation to the employers question why they are impressed at you but not at other candidates.