17 year old high school students love photography. How can we take this road well?

I don't think I need to say "put learning first". I heard too much when I was a student. Although it was repugnant at that time, it turned out to be an eternal truth.

There is no need to start with digital SLR now. You must first understand that there is no direct relationship between expensive equipment and excellent photos, but you are the link in the middle. First, shoot with your heart with a film camera. Don't underestimate domestic cameras. When you can take some photos that you are very satisfied with, you should consider investing more. In other words, after you have mastered the photography technology and have some understanding of photography, you should consider the equipment.