These websites will get you started with the whys and hows of planning your retirement.
This is the portal to Investopedia's coverage of retirement planning topics. "Learn how much you need to retire comfortably, and how to prepare for the "unexpected" in retirement. Prepare for everything from living expenses, to healthcare, to planning that trip you've always wanted to take."
"Get the basics on retirement planning and pension benefits, such as how Social Security works, retiring from the civil service, and managing a private pension."
Here you will find an number of Department of Labor publications on planning and saving for retirement, as well as ERISA and COBRA.
Khan Academy offers videos on retirement, IRAs and 401(k)s.