Hello, emevans-live-co-.
If your client hasn't set up a QuickBooks Online (QBO) account yet. He will need to access this web page and have your client click the link Create an account. Look for it below the Sign-in button.
Once already finished creating a QBO account, confirm the email address used. By this time you can send your client an invitation. They'll be able to log in to their QBO company now.
On a different note, here's an article that walks you through how to connect all your clients' accounts in one place: Connect accounts as a Master Administrator.
Also, with regards the QuickBooks Online Comparison which Version Is the best for you, I suggest check out this link: https://quickbooks.intuit.com/products/.
Feel free to message again if you have additional concerns. We're always around here to lend a hand. Take care!
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