Hello there, kaydebbie25,
QuickBooks Online offers short video tutorials made for getting started with QB. This will help your client learn their way in using QB. You can provide this link: Video tutorials for QuickBooks Online.
For training bookkeepers, you'll want to check out the ProAdvisor program. QuickBooks Webinars are offered as well.
If you have other questions, you can always leave a reply here. I'll be more than happy to answer them for you.