You have what looks like a Howeara Lava Burst. It's a hybrid orchid in the Oncidium Alliance. If you go to the orchid culture section of this forum or to
AOS | Home you can get a culture sheet on Oncidium orchids. A culture sheet is just a sheet that tells you how to take care of your orchid. Give the oncidium culture sheet a read and let us know if you have any questions.
Cheers