Great advice Bev. That last container is certainly colorful - nice!
Jamila, I think you'll find that sempervivum grow and reproduce pretty quickly compared to lots of other succulents. By only getting one of each you'll have more room to try out more varieties. Like Bev said, you'll want to keep name tags with them. At first it doesn't seem important, but when you start to trade or purchase more, you'll want to know the names.