I will turn 70 on Jan 2, 2018. Is there anything I should know or be aware of before I contact social security to start my benefits in Jan. 2018?
One thing that you should be aware of is that you will be asked what month that you wish to start receiving benefits, and you will have the option of choosing to receive up to 6 months of back pay. However, starting your benefits effective with any month prior to the month you turn age 70 would result in you receiving a permanently lower monthly benefit rate.
I don't have enough information about your other circumstances to be able to offer you much advice, but you may want to consider using the maximization software available on this website to compare your options and confirm your optimal strategy.