Naming the Parties - You begin the contract by naming the parties in the agreement. This may seem obvious, but attorney Mark Cohen of Colorado writes in his article Ten Things to Consider Before Signing a Contract that "a common error is to use the name of a person representing an entity rather than the name of the entity."
Describe the payment terms for the transaction, including the total amount for the service, how much and when the deposit is due and how much and when the final payment is due. Spell out a time line or milestones. Include specific dates for the delivery of parts of the service or the final deadline for the service to be complete.