Here is a good article by Steve Weber about the perils of buying turnkey websites. A lot of people starting out do this, and I know at one time I bought one too! Basically, these are cookie cutter sites that are sold over and over - it is practically impossible to make money with them.

There are no shortcuts to all of this. Any website for sales which had great potential would cost many thousands of dollars?not $39.95
“Turnkey” Websites: A Good Idea?