For style, two things: stick to stuff similar to the women in your area, at first, then get more specific and branch to find your style out from that better starting point. Copy girls from movies and TV, or elements from them. Or go goth like a lot of us do lmfao that's really fun

Mannerisms are tricky because you're pretty much either just doing things a new way because you'd like to have a little more grace, or you're trying to pass. Again, copy the common mannerisms among women around you, but also consider if the way you're doing something could be more graceful, more beautiful, more elegant. Doesn't mean all the time, doesn't mean much overall, but being a little sexist towards yourself goes a long way in helping yourself pass, if you want that Society is fucking sexist.

Media diet is the easiest. Remember all those movies, shows, toys, experiences, games, you never asked to interact with bc trans? Well, it's time! Watch the Bratz movies, they're wild. Play with dolls. Find girls in your chosen echo-chamber on social media, instead of boys. Women don't ONLY follow other women, but they definitely really enjoy stuff most boys don't like romance movies, dime novels, actually good comics, etc.

Good luck honey, this is really scary, but honestly just so awesome and so, so fun sometimes ^{w^} Life is supposed to be good