It is not a new post here ,however i only want to tell you what i know,and it is fit for newbie and not for experienced people.As a new site,the first thing the webmster should do is to write some unique content ,search engine like it very much,and do not forget to write page meta tag,like meta name and meta content.The second thing is to link back from some high PR site,one or two sites is enough,of course,the more the better,if you are will to do so,i have done so for a site of mine,you can go here for example,www.english-teachers.net,it just need about two month to go to PR5,and i only published my first link on www.sitesforteachers.com.The third thing is to show your subdomains as much as possible,you can wirte some articles and put your subdomains in it .