I recently had the pleasure of meeting Steve Farella, the co-founder and CEO of media agency Targetcast. Steve and his business partner, Audrey Siegel, founded the company right after the terrorist attacks in New York in 2001. Over time, they built a great company with major clients that loved their work. Last month, Targetcast was rewarded for its efforts by being acquired by MDC partners, the acquisitive agency holding company that earlier this year also bought RJ Palmer. Success stories like Targetcast make it seem like you'd be crazy not to try to start your own company. However, before launching …