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I am going to launch my websites. I am thinking about collecting the contacts of online, offline media and send them the press release, hoping they would be interested in mentioning my site launch in their media. Do I have to find PR expert to do this for me? Or is there any ways for me to do this by myself? Any suggestions? Thank you very much
Even if you go the electronic route, I'd still cherry-pick the most important publications and writers in your topic and contact them personally. Good luck!
For the UK, you need the Guardian Media Guide. That has details for all major news outlets. Then you can ring them up and find out which journalist covers your particular area.
As you seem to have assumed everyone else is in the same country as you, that probably means you're American, and I don't know what the US equivalent is.