here is the format of a press relesae. I hope it helps you get a better idea on how to write a press release properly. This is just an introduction.

There is a fairly standard format for creating press releases. It will help your credibility and chances of being published if you present your material this way. Each press release should include the following:

FOR IMMEDIATE RELEASE:
These words should appear at the top left of the page, in upper case. If you don't want the story to be made public yet, write "HOLD FOR RELEASE UNTIL ...." instead.

Headline
Just like a headline in an newspaper. Make sure this describes the content of the story.

City, State/Country - Month Day, Year
These details precede the story and orient the reader.

Body
This is where the actual story goes. There should be more than one paragraph, each paragraph no more than a few sentences. if there is more than one page, write "-more-" at the bottom of the page.

Company/organisation info
Include any background information about the company or organisation featuring in this press release.

Contact Information
Include contact person, company name, phone/fax, email, physical/postal address.

ENDS or ###
This indicates the end of the press release.

(xxx words)
If you like you could include the total number of words contained in the press release.

i agreed with P.sharma,

useful guideline for making effective pr for being visible on news search result.

- You have to decide first why you are writing a press release and determine your focus
- Keep it short and direct to the point. Usually, press release are no more than one page.
- print the words "FOR IMMEDIATE RELEASE" in the top left-hand margin in all caps. Follow this line with relevant contact information like name, title, address, phone number, email address.
-Create a headline and center it in bold type above the first line of the body of the press release. Headlines typically highlight the most important, significant or shocking fact in the release.
- Create a dateline - the first line of the line of the body of your press release that includes the city where the release is generated and the date.
-Make certain the first paragraph includes details all the vital information like the where, when, why, and who.
- Include some tantalizing peripheral details or facts to spark curiosity in following paragraphs. A good press release not only informs but also teases.
- Wrap up the last paragraph with a "for additional information" line, a place to find more details. An annual report or a website can be great sources of information.
- Center these marks, "###" or "-30-" at the bottom of the page to indicate the end of your release.
- print your release on high quality paper using a good laser or inkjet printer. You only get one chance to make a solid first impression.