The first thing that will be important for you to realize is that a press release helps you to get the word out there about your business, without it coming across as though you are "selling" something to those who are reading the press release - and there is really no limit when it comes to the frequency with which you can use press releases to keep your business at the front of people's minds.
In order for you to successfully promote your business without making it seem like you are trying to "sell" something, it will be necessary for you to write your press release in third person, and that you are taking a "neutral, but positive" approach in talking about the business and the topic at hand; in this way, you will engage the reader, while still remaining "neutral."
Finally, after you have written it, you will need to know what to do with a press release; the main reason so many people fail to take advantage of press releases these days is the simple fact that press releases used to be primarily circulated through radio and print media, neither of which are as lucrative as they used to be - but nowadays, press releases can be circulated online by simply submitting your press release to a press release database, which will give your press release a broad reach!
Take a bit of time to learn some of the keys to writing good press releases - then start writing good press releases, and start growing your business as a result!