The text of Acts 9:19-20 indicates he immediately began to proclaim Jesus in the synogogues.
He goes to Arabia for three years returning him to Damascus in 37 AD, Acts 9:22-25
v22 indicates he was increasing in strength and confounding the Jews who lived at Damascus by proving that this Jesus is the Christ.
Latter when he went to Jerusalem we have this recorded in 9:29, And he was talking and arguing with the Hellenistic Jews, but they were attempting to put him to death.
Paul wasn't afraid to get in there and mix it up with his audience.
I bet if he had FR back then he'd be on these threads daily.
LOL I think Paul would be at DU creating a new ID after being banned everyday.