If you want to use Eclipse and WTP (the classic way), please read this docs.
If you intends to run a Maven WAR project, you can adopt m2eclipse-webby, because it will be more efficient. In this case, follow this docs.
Download and install both Apache TomEE (1.7.2 minimum) and Eclipse IDE (not JavaEE version, because Webby doesn't work if m2eclipse-WTP is present).
The next thing you need is m2eclipse plugin. If you doesn't have it in your eclipse package, install it like another plugin.