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.
Once you have an idea of what you need, it will be easier to narrow down the options. Most software packages offer templates, but the software can be quite expensive. Templates can be purchased individually online, as well. But as a small business owner, you know that running a business is expensive, and you want to cut costs whenever you can. The Internet is filled with tools to help run your business, including free invoice templates.