If your account is within 90 days of signup, you have the option to wipe all the data in your company file and start all over again. Note: Once your data is deleted, we're unable to restore it.
Once you have the new account, you can import the list from your old QuickBooks account to the new one. Here's an article that includes information on what data can be imported: Common questions about importing data to QuickBooks Online.
If you have to open a new QBO account, make sure to click the Buy button to get the discounted price for up to some periods. If you purchase from the trial account, you have to pay the regular price.