Dude I very much recommend taking a look a this guide for hair.
http://ftmguide.rassaku.net/#headThe website itself is great for advice. I got a haircut like the ones suggested, slightly long, side part, with bangs. The bangs do a lot, I didn't realize that until my hair stylist chopped them off and I looked like a lesbian lmao. I have a super round face, basically no jawline, and just generally a soft face, but with this haircut, I pass 99% of the time(1% because my voice is kinda high sometimes). I'm pre-t (unfortunately) as well, and this haircut, I personally believe, is the best option for most transguys. I say that because a lot of the undercuts, short on the sides, full on the top, haircuts are common in lesbians, and many times, the hairstylist may deliberately cut it in a feminine manner if they read you as female, with this haircut, you can't look feminine, as he says, its a haircuts only guys get. This haircut frames out your face and will actually add more definition surprisingly than a short haircut. I can't recommend this haircut and guide enough man.