Sorry for not fully covering the bounce topic.
I have pretty much scrubbed my mail list and don't get many (if any) bounces any longer. The bounces would go to the reply email address provided in the initial setup. You would have to physically go into that reply-to mailbox address and collect the bounces in there. UE4 would not know that bounces occurred. I will provide a status of Success or Fail.
I don't think WA offers a CSV importing tool to MySQL at this time.