The functions that perform the insertion have already been written; the freelancer is responsible for identifying the “best” areas of a site for ads and then writing the code that inserts them.
Each website will require its own code but the majority of websites should only require 3-5 lines of code each.
The freelancer will use the top 100 websites from Alexa in the following countries:
If a website requires a free account to access, the Freelancer will be responsible for creating that account (e.x. hotmail, etc.)