There are many different factors that influence search engine ranking, one of them is the existence of substantive, unique content and the recency /freshness of page creation. This may prove to be problematic if writing is not your strong suite, or you are unable to write your own content. The solution is to purchase it either by hiring a freelance or going to one of the following website that I stumbled upon:
Constant Content
http://www.constant-content.com
Hellum
http://www.helium.com/
Daily Article
http://www.dailyarticle.com/