When I create a new invoice it is marked paid for a previous date and amount due is $0 when submitted for payment. How do I correct this?

Glad to have you join the Community, nturcsik77. Let me walk you through some steps on how we can correct this.
 

One factor why the invoice you created was automatically marked as paid is because the automated feature to apply credits to the invoice is turned on. Here's how to turn it off to keep it from happening:
 

1. Go to the Gear icon.
2. Select Account and settings.
3. Click on Advance and choose the Automation option.
4. Turn off the Automatically Apply credits.
5. Click Done.
 

In addition, if you wish to delete the invoice that was marked as paid and manually receive the payment, here's how to do it:
 

1. Go to the Sales tab.
2. Select Invoices.
3. Click Edit beside the invoice.
4. Then, click Receive payment.

 To continue, if you want to delete the invoice, here's how:
 

1. Go to the Sales tab.
2. Select Invoices.
3. Click the drop-down beside the invoice. 
4. Select Delete.
 

Moreover, you can scan through this article to guide you on how to customize and add specific info to your sales forms: Customize invoices, estimates, and sales receipts in QuickBooks Online.
 

If you need further assistance on how to edit your invoices or have additional QBO concerns, you're always welcome to leave a reply below. I'm here to help. Take care!