Youtube is one of the best places to learn about soundproofing pro studios.
Wikipedia is also great they list materials and sound transmission class.
You will need basic construction skills. I would recommend hiring a pro to help you. Mistakes are expensive.
Your students will need the best soundproofing to separate drums, piano, guitar, vocals recording…
I recommend concrete blocks for the drum room.
With the right materials and design you will get great results. For example some libraries have recording studios and media production studios. I saw an opera vocalist in a vocal both but couldn’t hear them.