Make sure your resume includes your current contact information and work history. Save your resume as yournameresume.doc, rather than with a generic file name like "resume" so the hiring manager will connect you with the resume when they review it.
Have a basic cover letter ready that you can customize for each job you apply to.
Some sites let you upload an existing resume from Microsoft Word on your computer with the click of a button. On other sites, you may need to copy and paste from your resume into an online profile or use a resume builder that is incorporated into the job application system.