Eric 6 User's Guide/Getting Started
Eric is a wonderful tool to work with if what you're looking for is full-featured, comprehensive Integrated Development Environment (IDE) for developing Python applications. Is that really what you're looking for?
This guide (and Eric) assumes that you have working installation of Python 3 and some experience using it.
If you have limited or no experience with Python, head on over to the Python web site. It contains a tutorial, extensive documentation, instructions on installation and much more. Review the options for installing Python on your OS (Linux, MacOS, Windows). Take some time to get comfortable programming in Python with IDLE, Python’s built-in Integrated Development and Learning Environment.
There are innumerable Python resources on the web, including several WikiBooks.
If you plan to develop applications with a Graphical User Interface (GUI), some experience with event-driven, object-oriented GUI design software would be at least extremely helpful.