What can I do to prepare for future transition? (mtf)

So im a trans girl(17) and a pretty steryotypical one at that. I live in a transphobic household so anything i do must be easily kept secret. I know i want to learn makeup and without recourses the best i can do is study online videos and i have pintrest to make outfit ideas that i like to see what works.

Bassically im asking what i should do mentally, physically, and educationally when it comes to being a girl. I know theres things i probably focus on too much that are minor or things that i might handwave and they become a big problem. And i know i'm privledged to possibly have the oprotunity to get hrt at 19 and im very glad for that. So any tips or thoughts on how i could better arm myself (amd how others reading could) to better prepare ourselves for woomanhood?