Is there a way to number my submissions?

How can I consecutively number my job order forms?

You could add the submissions counter to your form, it will show the total number of submissions your form has received. 

You will find the widget here: https://widgets.jotform.com/widget/submissions_counter 

This guide will help you adding the widget to your form: How-to-Add-a-Widget-to-your-Form

Hope this helps.