Heaven Studio won’t include any tutorials for existing Rhythm Heaven games. It is not a replacement for official games, and therefore does require knowledge of the original games. Any games NOT from the Rhythm Heaven series, such as Meat Grinder and Rhythm Sōmen, will get their own practices.
I would think there should at least be a controls tutorial/guide, especially where the official control scheme of a game (i.e. Rockers having a hold-and-flick touch screen system in DS) is entirely different from how it works in Studio. Even just a controls-list readme like "in DJ School, hold A to stop the record, then [insert action here] to Scratch-O" would go a long way to help.
Requiring prior knowledge of the official games to know how to play a game well is fine. Requiring trial-and-error to figure out which inputs do what game actions is a bit much.