To purge your QBO account, the account (i.e Essentials or Plus) must be within 90 days old. Follow these steps to reset your company data:
Sign in to your QuickBooks Online account.
Edit the URL on the address bar. remove everything after app/and enter purgecompany. For example: https://...qbo.intuit.com/app/purgecompany
Click Yes to confirm the action.
Otherwise, you have to open a new QBO account
Hello there, restoredapparel.
Yes, you can delete and create new Products and Services in QuickBooks Online (QBO). I'll guide you how.
In setting up your new Product and Services, click the New button and choose which categories you want.
For more detailed instruction, you can watch these tutorials:
Since you also mentioned that you're new in this, I'll also include another tutorials so you'll learn more.
I’m just a few clicks away if you need further help.