Your plant will be sent as a cutting. It may be rooted or uprooted. Your plant may or may not look exactly like those in the pictures.
Euphorbia lactea is a very popular succulent for both the patio table and the greenhouse— it is very easy to grow. They like bright light but I try and keep mine out of the direct hot Texas summer sun. Let it dry out between waterings and be sure to plant it in a well draining soil.