go to youtube and enter something like "csp [name of tool] tutorial" and repeat for all the tools in the toolbar. Not sure if all of them have a tutorial available but you'll find the basics. Clip Studio itself also have tutorials on their website and there are some on art sites like deviantArt, though they're more aimed at drawing than explaining the tool.
All in all, it depends on your past experience with digital art programs and what you want to create. Do you have an art tablet? If not, you either need to get one or you'll be very limited in what you can do I'm afraid, though some people still make some really cool stuff with mouse only.