Hi, Anita.
Thank you for reaching out to us here in the Community and I appreciate your client's loyalty to QuickBooks.I'm here to help you with setting up your client's lists and names in QuickBooks Desktop (QBDT).
We have help articles, video tutorials, and other discussions that will help you ease the process. From the fresh file, you can check out these links as your guide in handling your client's products and services, accounts, employees, vendors, and customers:
Once done, you can also review the topics from our help articles for more tips about QuickBooks. From there, you can learn more about the following:
If you have any other questions about QuickBooks, let me know by adding a comment below. I'm more than happy to help. Have a good one!