You can download the standard version of Eclipse that contains the basic bits for any Java developer to start coding in Java.
Eclipse also has pre-defined packages based on the type of development you want to do with Eclipse.
Eclipse Marketplace is a great source of plug-ins and product that you can add to Eclipse. Browse the online catalog or use the Eclipse Marketplace Client from within Eclipse. Look under the Eclipse Help Menu.
Popular Plugins:
These are a few of the popular getting-started documents for someone new to Eclipse: