Writing templates are widely available online. A Google search will lead you to websites that offer downloads of different templates. Some of them are even free. These prepared formats often come in predetermined categories and include sections like the title, introduction, list, and ending paragraph. All you have to do is fill up these sections depending on your chosen content.
How can you expect your customers to take your business seriously if your invoices do not appear professional? An invoice is the last impression you give to your customer. Why not close the deal with an invoice template that is professional, free, and easy to use? A professional invoice is critical to your companys credibility, not only so your customers pay you promptly, but also so they call you again for future business.