Alter a Joomla freelance script

Take a joomla Freelance script and modify it to act like a freelance script but its really for business owners to contract other business owners for advertising. Requirements : Joomla PHP Email Cron Jobs, Use acy mailing (joomla) Allow Business owners to create a chart of visitors, email lists, traffic. Business can approach other businesses to run ads thru their email list or on their websites. It's like freelance but for advertising purposes. the Business gets to post how well their company is doing also demographics, country, ages, gender, spending dollars etc. Must be able to take (joomla) Joombri freelance script and alter it.