I have an existing site with a good page rank and traffic. I Want to start a new site, but thought that maybe it would be better to register the new domain, put some placeholder content on a single page on it with some ads, and then create a subdomain on the existing good site. On the subdomain, I would then start writing loads of content, and working on traffic. At some point (exactly when I am unsure of -- likely when traffic starts coming in at a good level) I would move the content to the new domain, and put in redirects to the new site, while killing the content on the old subdomain to avoid dupe content penalties. Is this a better strategy to creating a new site, than just adding new content to a new domain straight away? (maybe avoiding sandbox?) Would it be legit to throw adsense on one page of relevant, good placeholder content on the new domain in the meantime, to at least try to get some coin coming in right away? (the new domain I have is a pretty good bet for good type-in traffic)
Personally think you are much better off just buying the domain and then aggressively building relevant inbound links to your new domain, especially from well trusted domains in both your industry and probably a couple of paid directory listings. This should see you out of the "sandbox" if there even is a sandbox. Then just target some more of the niche topics within the industry and then slowly but surely build the content and build you links. If you just buy a domain and place like a one page site on it your never going to get out of the sandbox because your not building any trustrank. I think building trustrank is far more important than an aged domain. The reason that old domains are trusted is because they were around before Google started implementing trustrank therefore Google is just assuming that they are trustworthy - plus they normally have good number of inbound links.