I want to erase all my sales data and start again as I have not been using this as a real business tool

Hello jmoore6,

Welcome to the QuickBooks Community.. I'll be happy to share more info and help steer you in the right direction so you can continue to focus on the things you love the most. QuickBooks is an easy-to-navigate program that simplifies most of your complex accounting calculations. 

Based on the details you've shared above, I highly recommend checking out the following article as it shows you how to: Void or delete transactions in QuickBooks Online. I encourage you to go through the article and let me know if you have any other questions. I'll be one message away in case you need help. 

Otherwise, I wish you a great rest of the week!

@jmoore6 

You can use a deleter tool

https://get.transactionpro.com/qbo

Use a backup restore app to lower any risks.

https://partnerwithus.rewind.com/quickbooks