This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
This is all covered in Tomcat's documentation, so all anyone can do to answer this is repeat what's there. Please try to follow the docs first, then feel free to post any problems you encounter and people will probably help.