That's not a good thing. You should read this this
thread, and http://www.kitten-rescue.com
will be very useful for you. You might also want to start your own thread over in the Pregnant Cats and Kitten Care
Hopefully, you're wrong on the kitten's age. If the kitten is already weaned, then you'll still have to do some special things to take care of a younger cat away from its mom, but it will be much easier. Cats in general are usually quite upset and shy when they are moved to a new home, and with a 3 month old kitten, you should let the kitten alone to get used to the room by itself. If it's really young, though, you need to give it a very small safe, warm place to stay.