How to come out [coming out]

Hello I am 15m and have figured out I am bisexual with a preference to women but mostly because dudes my age can be real jerks. Anyways, I have very supportive and liberal parents who support the lgbtq community, but I’m not sure how they’d feel if I came out. I don’t want to make a huge deal out of it but I also don’t wanna just drop it out of no where and surprise them like t. Very common question, I know, but what’s the best way to come out