Do I need to do revision on my accepted paper?
I would interpret "accepted" as "accepted in its current form", i.e. you do not have to make any changes.  But in order to be sure, ask the editor or program committee.

If you want to make changes based on the reviewer's comments, that is most likely possible; but again, you should ask the editor to make sure it is okay, and to find out when those changes would be due.