Congratulations on starting your new business. I'm glad to see that you're interested in the QuickBooks programs. If you and your wife require access to the software, I suggest using QuickBooks Online Essentials or Plus. These plans allow for multiple users so you can each have your own login information. To know more about the different QuickBooks Online plans and current promotions, check the official page here: https://quickbooks.intuit.com/ca/pricing/.
QuickBooks Self-Employed was made with sole proprietors in mind and doesn't offer a multiple users option. For more details about the QuickBooks Self-Employed software, take a look at this page: https://quickbooks.intuit.com/ca/self-employed/.