I'm glad to hear that you're already using QuickBooks Online. It's the software I recommend for bookkeeping. Be sure to check out my other recommended business tools HERE.
I also have a YouTube channel where I create helpful how-to videos for online business owners who do their own bookkeeping. Be sure to check out my videos and let me know if you have a question I could create a video to answer.
QuickBooks Online Tutorials
In addition to my YouTube channel, I have tutorial articles that will help you understand how to handle bookkeeping issues for different eCommerce platforms.