I'm a teenage pre-op ftm and I need tips for passing?

Next year, I'm going to be called by male pronouns by all of my teachers, if all goes according to plan. I'm definetly male inside, but I do have a feminine edge to me, and I have a taste for the darker things. I have a tendency to dress solely in black, usually in collared shirts, but other things, too, such as band t-shirts, t-shirts with odd designs (for example, one of my favorites has the Ouija board on it), and other things like that. I never wear a t-shirt without a long-sleeve undershirt if I can avoid it, but that may change soon, because I have a deficiency in vitamin D, so I have to get more sun. I have a small chest, probably an A Cup, and wear sports bras, but it still doesn't satisfy me. Maybe I'm just paranoid, I don't know. For pants, I tend to wear pinstripe pants, and I don't like skinny jeans all that much. I love my combat boots, and I can't imagine wearing anything else... I wear boxers over my underwear, which I only wear in case of that time of the month sneaking up on me and making drama. I don't pack, but I'm not sure how, really... I wear eyeliner, sometimes gray or black shadow, too. Sometimes I do red liner under the black. My hair is cut with the sides really short and red, except for the little part in front of my ears, which is grown similiar to sideburns, and dark brown. The middle is long and dark brown, and I like it that way. Do you have any ideas? I mean, I guess I pretty much answered all my questions, but if you have any suggestions, it'd be great. Maybe ways to make my voice seem deeper without T, or how to walk, or postures?