Invoice 00560 comes up when i want to create a new invoice buy it has been used and i can't get a rid of it or make a new number

Hi there, 

We're glad to have you as a QuickBooks user! Don't worry, you've come to the right place for help. 

Normally, when you're creating an invoice, QuickBooks picks up on the last invoice number you used and continues with the following numbers in a chromnological order. I encourage you to take advantage of the custom transaction number feature which QuickBooks offers. You can activate this feature by following the steps below: 

1.     Select the Gear icon on the Toolbar, then Account and Settings (or Company Settings).
2.     Select Sales, then select anywhere within the Sales form content section.
3.     Check the box next to Custom transaction numbers.
4.     Select Save and then Done.
5.     Open an invoice or any sales form, and in the Invoice no. field, enter the custom number or letter sequence you want to use for your forms. The sequence you set here applies to all sales forms. 

Give these steps a try and keep me posted on what happens. I'll be on standby in case you need further assistance. :)