Most scholars believe that the term Hebrew was a term meaning descendants of a man names Eber, so I think that Eber would be considered to be the first Hebrew man.
Abraham, around the year 2000 BCE
The vast majority of men in the world are never circumcised, so there's not really an answer to your questions. Jewish infants are circumcised 8 days after birth. However, circumcision is very rare in most parts of the world.
Phil:3:5: Circumcised the eighth day, of the stock of Israel, of the tribe of Benjamin, an Hebrew of the Hebrews; as touching the law, a Pharisee;
Hebrew has been spoken for many thousands of years prior to the invention of Hebrew writing, so no one knows what the first Hebrew word was. The first Hebrew word in the Bible is "bereshít" (בראשית)
Yes, if the first circumcision went wrong.
first is Rishon in Hebrew. In Hebrew you spell it Reish, Alef, Shin, Vav, Nun - ראשון
He was circumcised. His mother hid him for 3 months before putting him in the river, and Hebrews typically had the circumcision / naming ceremony on the 8th day after the birth. No other people-groups circumcised their young at this point in time.
He is definitely circumcised
Yes he might have been circumcised.
Saul became the first Hebrew king.
The Hebrews were the first to adapt the Phoenician alphabet for the Hebrew language.
It wasn't the Jews (plural) who wrote the first Torah, it was Moses, at God's dictation (Exodus 24:12, Deuteronomy 31:24). See also the Related Link.How did the first Torah-scroll come to be
I did, I had all my sons circumcised. My father did not have his son circumcised. (Me) I had to have it done myself.