In case you don't know who I am, hello

! I'm a 17 year old (18 in October) "half-closeted" trans girl! (half-closeted as in, my friends irl and online know and I've revealed publicly that I'm transgender, but my family has no clue about it because I'm scared to tell them.) I need some help with this whole thing, because I'm kinda clueless when it comes to any of this. This is also sort of an update to other outdated posts I've put in "non-binary talk" so I'll sum up what's happened anyway.
About half a year ago and more, I identified as non-binary or half male/half female and used "they" instead of "he" on the internet for the longest time. But in February when I went to a band dance thing, seeing a lot of women there and wishing I were in their shoes, I had a slightly stubborn revelation that instead of a sort of "half and half" thing with my gender, I thought I wanted it more 75% female/25% male, if that makes sense. I was still using "they" but I was more accepting with people using "she" if they had to. It was only a few months before I realized that maybe being 'non-binary' like that wasn't quite what I wanted.
When I was finally fed up with being unhappy with my identity, and realizing that the only real reasons I wasn't fully transgender was my family, and the fact that maybe I wasn't ready to accept the fact that I wanted to be a girl, I did a sort of weird test run with my close friend and boyfriend trying out "she" instead of "they" and every time they referred to me as such, I'd feel a huge flutter of excitement down my spine. I had finally found who I am and wanted to be for so long. The next day I made up my mind and told a my friends the good news and that this newfound identity made me happy to be who I was for once.
Before this, I absolutely hated myself and my body and who I thought I was, but even now, months after that, when my depression and anxiety is kicking in again, I can find it in myself to actually appreciate and like who I am finally.
Okay, so now that you know my life story, lol... here are a couple of things I have questions about Family - What's the best way to tell my them without me freaking out and being speechless? I've tried using a notecard and sitting in my room while my mom finds it, when I told her that I'm bi/pansexual but that seemed to make me more anxious than anything. I do electronic music and I was wanting to make an EP with lyrics about different aspects about my depression and anxiety ending with a confession song about me being transgender, but that's ending up with more work than I thought I'd have to put in to be done in the time frame I wanted to tell them in. (still doing that EP though, just at a later time.)
Estrogen - I don't even have a clue how to get this without getting a doctor's or gender therapist's approval or something, but if there is a way, How much average does this stuff cost per month? (I searched it up and didn't really get anything from it)
Gender Therapist - How does one go about getting a gender therapist? I have a place saved that's in my town, but I'm generally extremely anxious about saying this stuff out loud. Are there any online alternatives that let me use text to talk to them and still get their approval for estrogen? If not, how am I going to bring it up to them if I go to their office (because my people skills are nonexistent)? How do these even work? How long until they give their approval?
HRT - probably should have grouped this with Estrogen, but these are more specific to if I can't just buy it normally. How does this work/how are the hormones distributed into the body, and how long about until I start seeing physical results? Cost per month?
SRS - Now I've done a lot of research and even though there are downsides afterwards, I'd still want to go through with the "bottom surgery" but that's about it for surgery. How much would that cost?
Anything else I should know about starting my journey eventually or any words of encouragement or just general advice? This post sorta intimidates me because it feels like a huge level-up from where my identity was in February. Feels like I've really grown as a person since I last posted on this site. Forgive me if this is a lot of specific questions, but I'm flinging myself into potentially scary things I feel like I know very little about, so I need a decent amount of information about how to do all this. Thank you in advance!