A job invoice is not much different from general purpose templates. Simply put, a job invoice template is one with a lot of space provided for the description of the different elements of the work done, each with a corresponding charging rate and the corresponding cost. Such a template has a field for accumulating all the costs. Generally, a job description template is landscape oriented with loads of lines.
There are several neat and useful job invoice templates available on the World Wide Web, so you will not have a difficulty finding and using one for your purpose. Apart from these nature specific fields, there are the usual fields of date of issuing the invoice, the invoice number for future reference and the company name and address at the top of the template. There is a field to add taxes, as applicable, to the accumulated total of the broken up costs of each job.
Sample Job Invoice Template