I would hazard a guess that it is a Bougainvillea, a tropical, woody vine, originally from South America, Brazil in particular. The like a lot of sun, full sun is okay. They want to go from wet to just about, but not quite dry, then get watered again. If the leaves wilt, it is too dry by 24 hours. Don't use a watering can, take the plant to the kitchen or other sink, and flood the pot with water. Allow to drain then return to window sill.
Many keep these as outdoor in the summer, inside for the cold winter, type bonsai. Beautiful flowers a couple times a year.
What to do, Start reading. In the Resources section of the New to Bonsai Forum. Also read the threads on Bougainvillea in other forums. Other than keep it watered and give it light there is nothing that needs to be done "now". So you have time to read up on Bougainvillea and on Bonsai.