Honey first let me say that you are / will be his mama and you can't do anything wrong if you're doing it out of love and you are researching the topic. That said, I would GOOGLE the topic and watch some of those video clips on circumcisions. It isn't easy to watch. If you feel it is necessary after that then that is your decision.
My twin sons are not circumcised. They are about that age where the skin is started to retract or be pulled back by them. Our pedi even suggested to start putting ointment on it but NOT to pull it back or force it to move back. One of my little fellas has been looking at himself and he pulled it back himself...nothing happened and he is fine. Now I help him understand to keep it clean.
I would talk to family and see what others did. Some say that my sons will feel odd being the 'only' two not circumcised in their gym class. Hmm, I don't know about that. I know plenty of mamas who did not circumcise.
I believe it does hurt. I believe it isn't medically necessary but if the little boy grows up to be an unclean man then he will have problems later and most likely cause problems for his female partner/girlfriend/ wife.
Good luck and don't worry too much.
(now if you want to discuss vaccines for your son well I have plenty to say about that.)