Hi there AmandaPants,
It's important that you have the best software in order to be able to manage your books effectively. QuickBooks Online is a great tool able to help you access your books from anywhere with an internet connection. I can provide some information about transferring the information from QuickBooks Desktop to QuickBooks Online.
In order to do this transfer of information, you can do so by connecting to your QuickBooks Desktop on your Windows PC and following these steps. This would have to be done on the Windows computer, as QuickBooks Desktop is not able to run on the Mac. Once transferred into QuickBooks Online, you'll be able to connect to your account from any Windows or Mac computer by opening a browser, and going to qbo.ca to sign in.
If you have any other questions, feel free to reach out here.