Hi canadaclean,
Welcome to Community! QuickBooks Online has everything you need for customers, vendors and even projects for specific customers. I'll be happy to provide more information so you're on the right track with your QuickBooks goals!
Your customers pay for products and services that your business offers. The Projects feature helps you organize a specific job for a customer, making it easy for you to track areas such as income, expenses and profitability associated with the job.
Feel free to reach back out if you have other questions. We're here for you!