I would highly recommend that you convert from QuickBooks Mac to QuickBooks Online or to QuickBooks Pro 2018. The primary reason is that Intuit is no longer going to offer the Mac version of QuickBooks. With that said, it sounds like QuickBooks Online Plus will work for your business. I recommend that you take a look at the following resources which will give you some insight into what will (and will not convert). I also suggest that you contact the Intuit support team and allow them to convert the data for you. They will do it for you free of charge.
This article includes a link to the step by step conversion guide for QB Mac:
This article does a side by side comparison of the 3 QuickBooks Online subscriptions available. You can also sign up for a free 30 day trial of QBO, just click on the link in this article to get started:https://fitsmallbusiness.com/quickbooks-online-comparison/.
All the Best-