This would combine your logo and your contact information as well as any other graphic elements that you choose to include. Just make sure that there are no graphic elements that will interfere with printing and readability. Once you have letterhead created with your logo and contact information. You can then use it for all the materials in your press kit by easily printing from your home printer. Again, this creates a strong consistency for your materials as well as providing a fail-safe way to make sure that all your contact information is included with everything you send out.
Double check dates against a calendar to make sure that the day and date match up.
Double check phone numbers by calling them. Double check spelling by laying out your text in a word processing program that has spell check. Finding a Designer. Take my word for it you need a real designer. Do not just learn Pagemaker and assume that your materials will be ok.