Do you receive a social security statement? If you haven't already done so, You can also register online with ss administration for online access. They will use some form of verification to identify you.
Your ss statement or online info will tell you approximately how much you will make .....I believe they take your current earnings and estimate your monthly ss pmt. You can start receiving benefits as early as 62 but if you delay till 65 or 70 I believe you receive more.
And yes you can receive your benefits anywhere in the world (as long as US based banks send $$ to that country)