Yes, I would definitely suggest you to find a good teacher and a good Buddhist community when practicing Chan meditation.
Here, you can find teachers of different traditions, including Chan: http://www.buddhanet.net/masters/index.htm
As you progress in practicing Chan meditation, you may sometimes encounter meditative states. Without a good teacher guiding you, you may become attached to these meditative states, and stop making progress in your practice. These meditative states indicate progress, but they do not mean that you are enlightened, so you need to be vigilant of them. If you don't have a teacher by your side to guide you step by step through your practice, I would suggest you to thoroughly read the Shurangama Sutra. In the sutra, all sorts of meditate states are described so you can recognize these states in your meditation and not attach to these states.
You can read the Shurangama Sutra in English here:http://www.cttbusa.org/shurangama1/shurangama_contents.asp