The meat of your contract. What are the conditions of your relationship with your client? Who owns the work you produce? What happens if the project is delayed? Do you get paid a kill fee if the client walks early? Answer this here.
Who is responsible for what and when? What does your client agree to do? What do you agree to do? Outline everything the project will require and avoid doing more work than you're being paid to do.
Setting a Timeline
Keep your project on pace. Agree when you'll meet to discuss the project and when you'll hit major milestones. Stay focused, make room for more gigs, and stop having to answer "when will this be done?"
Clarifying Costs & Payments
Let your client know every penny they'll need to dedicate to the project. Building a website? How much does hosting cost? How about a domain? How about the cost of your services? And oh yeah, when does the client need to pay you to keep the project moving forward?