Toners, I think, just make sure that you have all the dead cells and junk cleared off your face before you put on your acne meds or whatever. It's up to you whether to use one or not. They are particularly good if you wear makeup, but since you're a guy you might find they're not necessary.
Also, if your skin is really sensitive, I would advice against it unless you could find one that's VERY gentle like rose water or something. Most toners fall into the category of astringents and that can be very bad for people with acne. I have never been able to use toners even though I wear makeup because my skin is so sensitive and dries out so easily.
Just experiment. If you think a toner might help, give it a shot.