Throw out all of those sticky notes This 8.5" X 11" book is perfect for you to keep track of your customers/clients (name, address, e-mail, phone number and birthday) and sales (date, item, price, ordered, received, delivery method and payment). This will help you keep you small business organized for 100 customers. There's also a space for you to keep track of any notes, prizes won, discounts, returns, etc.