Have you checked out videos on youtube? Watch summer lookbook and haul videos. It takes a little while to find a youtuber that fits your style. After you find a few that you like, you can just buy outfits that they mention in their videos.

With your boards, most of the outfits you pinned only have high heels. Some people can wear heels to school, but they usually aren't stilettos or pumps like the ones in your pins. Wearing heels for a long period of time really hurts so you need to also find pins of more practical outfits with shoes that you can wear to school. You can wear flats and simple minimalist sandals with most of the a line skirts that you are interested in.

It would also be a good idea to find practical feminine outfist that you can wear to school. Those a line skirts that you like will often fly up in the wind and you need to wear a pair of thin shorts like these underneath. A line skirts are pretty annoying to wear everyday, so you should look into also look into buying a other skirts, shorts, dresses or rompers that you can wear that you won't have to hold down when you walk. You can still get a line skirts, but you should also have more practical bottoms too.

It seems like you like eyelet pieces, so you can put that search term into clothing sites like this one to find pieces you like. You should also check out ASOS for pleated and a line skirts.

You can always go to the junior section in Nordstrom and ask one of the sales associates to pick out outfits for you, it's their job to do that there.