Using lawyers in wholesale/assignment deals

I'm interested in the wholesale and assignment aspect of real estate investing. Do I need a lawyer to close a wholesale deal or can I do a deal without one(trying to keep my expenses down)?

Marketing a website for assignment or wholesale deals

How do I use a website to promote my wholesale and assignment deals? Can the website be used to attract both sellers and buyers? If so,when is the website to be used,in the voicemail message or somewhere else?