You will automatically get a copyright the moment you start posting material on your website. You just need to put a copy-right mention at the bottom of the page.
Unless your website really takes off, dont expect to make a lot of money via Adsense or other advertisement. Your site has to have numbers before people advertise.
In starting a business on the internet, its all about Name! Name!! Name!!!
Your website name should be identifiable with your business. PG is the exception here but note that it is the exception, not the rule!
Whatever you've read abt name, domain name and registration, you've read wrong!
I'm a super-mod on PG, so no, i dont work for PG