This tutorial will detail the tools for duplicating, renaming and deleting objects in a scene.
The final three options on your bottom menu that may be of use are Duplicate, Delete and Rename.

- Duplicate
This tool allows you to choose a object in your scene and duplicate it and its actions. - Delete
This tool will remove an object from your scene. - Rename
This tool will allow you to rename your object to keep your layers nice and organized.