Questions about PE/HF

I’m currently a Sophmore at a high school and my dream has always been to be in PE or HF. This post might be long so brace yourself, am I looking at this stuff to early or should I have been looking at this for years now?
What schools are considered “target” schools and do firms have bias towards certain schools?
I currently have a 4.3 and am planning on going for a 5.0 is that good enough to get into a target school or will I have to participate in lots of extra curricular activitys ?
I’ve done my research, but I still feel as if I barely know anything about the world of finance or of PE/HF: what exactly do they do, what exactly do they make.
Lastly should I be attempting for internships over the summer and if so which ones
Anyone who could try to answer all or even 1 of these questions would be much appreciated.