Running your business with QuickBooks Self-Employed means you'll be able to take advantage of tons of time-saving tools. Entering your invoices and recording their payments couldn't be simpler, and it's important that you're able to see your income transactions clearly. I'd be happy to point you in the right direction for support with this.
Since you're using the Self-Employed version of QuickBooks, I'd suggest reaching out to their support team directly. These dedicated Self-Employed experts will be able to assist you in navigating your account, recording your transactions, and explain how to place your invoice sales into the correct income account.
In the meantime, here's an article to get you started: