I don't work for less than this.
I won't do that without a contract.
I don't give advice for free.
I don't offer discounts for this type of work.
I don't sell that type of product.
I won't make an appearance unless there's a deposit.
I don't do installments.
Defining what you won't do helps you to move away from the customers who don't appreciate what you will do. Finding the right customer starts with you defining how you work.