The IDE has an entire menu devoted to packages.
The Open xxx menu items open a loaded, or recent or specifically-browsed-for package in the package editor, which gives you access to information about the package, as well as ability to edit aspects of the package.
The Package Graph... and Package Links... items give you access to tons of information about all the packages the IDE knows about, and their inter-relationships and inter-dependencies.
The New Component... item is a wizard-style series of dialogs which walks you through the process of creating and registering a new component (and perhaps a new component editor, if needed).
Components are registered in the component palette using the Register call which must contain one or more calls to RegisterComponents().
This procedure takes two parameters, a string specifying the page in the component palette where the component will be placed (it can be a new page, or an existing page), and an array of component classes containing the classes to be registered (the array may contain one or more classes).