How do I create a deb package with basic dependencies?

Hi so I am trying to create a deb package for a web application written in Java (it uses Apache Tomcat). My eventual goal is to start a repository that people can add to apt-get the software, but

1. How do I make it so that the package knows to look for dependencies like tomcat, sun-ja开发者_如何学编程va6-bin, and ant?

2. How do I write an installer script to place the files and folders in the right place?

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There is a great tutorial at http://www.debian.org/doc/maint-guide/