Need a little help

Okay so don’t be judgy, I don’t have any female figures in my life. Just my brothers, dad, and two uncles. I’m literally surrounded by men and it’s weird talking about female things. I do have a sister but she’s younger so I have to be a role model to her, im so lost with myself that it’s hard to help her. I also want her to have a regular physical done. How do I schedule a doctors appointment with a gynecologist for myself? How do I schedule an appt for my little sister? I’ve never been sorry if I sound silly but I’m 18 and want to be more independent and way more on top of my health because I haven’t been. Thanks in advance and if it’s okay if I message you privately with any other questions I have can you comment that also?