Please help me to identify my plant so I know how to take care of it. thank you very much
Hi Jen, this looks like X Graptoveria 'Debbie' or something similar.
X Graptoveria are a generic hybrid between Graptopetalum and Echeveria, and luckily, they both require similar care.
Here are some links to pages on my site with information on succulent care for a general overview and how to grow Echeveria which has more specific information about these intriguing and beautiful succulents.
You can see a picture of x Graptoveria 'Debbie' about halfway down this page.
Some advice for you; take the plastic off the plant - this is to protect it in shipping, but it will hold in too much moisture; all succulents need air and ventilation and low humidity.
Happy Succulent Growing!