Hey, i remember coming out to my friends that im bi, we was in the car one day and doing some silly truth pendant thing and said something like "will i ever have sex with a woman" and it came up yes and so i said "cool" and that was that, we got talking about my bi sexuality. I would say that you should tell a few close friends to begin with, and you should just get more and more confident with the nature of being out.
As for your parents, I cant say Ive ever told mine, not had the need what with having a bf for some years, but i think maybe id just bring a lass home if i was going to, and just deal with it when it happens, but it seems like you're more likely to have a bf than a gf, it might be easier to just broach the subject, maybe with a sibling if you're close. If not just blurt it out over dinner and just run and lock yourself in the bathroom till they come to terms with it? Maybe not the best idea in fact, but i dunno about parents, im just as much a coward.