I am 69 and plan on starting on Social Security when I turn 70 this December 2016. My wife is 61 and basically was a stay-at-home wife but did earn enough working to qualify for SS. My two questions are: What to I have to do to make sure that my payments begin when exactly when the SS system defines my turning 70 so I do not leave money on the table and 2) when should my wife begin to take her benefits?

Edward,
Social Security encourages you to submit your application for benefits 3 or 4 months before your entitlement start date. So, you should apply in Aug or Sep for your retirement benefit to start in Dec. Your wife can apply for her spouse's benefit at the same time.
Best,
Mike