Another way to get these pre_made invoice templates is to hire a professional to design a template especially for your firm. In some cases this is a valid way to get a template that really stands out in regards to others. In most cases this is not necessary as every small business needs to look after his costs and simply buying a professionally looking pre_made template is much cheaper that designing one especially for your business.
Now, you have thousands of free document templates that can be turned into web forms. What you need is, open MS word. Then you will need to go to your title bar and move to file. Here you have several existing templates to choose from. You can choose anyone among them and modify them according to your needs. Apart from changing the forms, you can start with a scrap or, blank template.