Not a stupid opening question but a very sensible one, because the right tools are part of the cost of getting into the sport. No one wants to wait for delivery of a unicycle only to find they need to buy tools to assemble it.
Everyone with a bike or unicycle could do with a tool box containing a pedal spanner (US = wrench) and a decent set of Allen keys (do you call these hex wrenches?). A small (1/4 inch drive) socket set is also useful, and a selection of screwdrivers, mainly cross point. In the UK, Pozidriv is more common than Phillips, but this may vary in other countries. I believe Canada uses Robertson square tipped screwdrivers.)
Later you’ll need things like crank extractors and spoke keys, and of course tyre (US = tire) levers (US = levers, but pronounced differently! )
Most of the tools (screw drivers, Allen keys, small socket set) have many uses outside of cycling, so you should buy decent quality. I also have a small Park Tool torque wrench capable of taking small Allen key bits; it’s nice to have but not essential.
There is nothing on a unicycle that is complicated, so it’s a really good starting point for developing your mechanical skills.