I'd like to publish a Press Release for my language Q&A site.
Many thanks !
A few thoughts that I use for myself. I don't know hardly anything about your situation so you'll have to determine what applies to you:
THE PRESS RELEASE:
Hope that helps some.
I have upvoted Chris's answer, as I have not much to add except for our practical experience:
Assuming that you have never issued a press-release before, I'd suggest you go for a PRWEB package that enables you to add keyword-reach links to your press-release. It used to start from $200, and is a very good way to seed a bunch of incoming links. I believe they will also edit your release for spelling and clarity at no extra cost.
Also consider eReleases, which is basically a (cheaper) backdoor to PR Newswire that otherwise would cost you an arm and a leg.
In any case, you must also try to establish contacts with specific journalists covering your niche and send them your news in advance.