With the MiniRok there are a few things to keep an eye on:
We don’t use an air filter for big events but I strongly recommend one for club racing particularly with a new driver who may be off track a few times. Keep an eye on the boot itself as some of the products out there have a tendency to tear. The filters themselves can be cleaned with soapy water.
A newer driver will go through some spark plugs - if they are coming back black and wet you’ll probably foul a few out early on - keep spares on hand.
The wires on the coil should be zip tied snug to the coil so they aren’t flopping freely. Lessen the chance of having an issue with a slightly sensitive part of their components.
I would get a few fuel pump rebuild kits and change them out every few weeks. They will loose their snap if you let fuel lay in them between events so blow out or drain the fuel from the pump at the end of the day.
The clutch drum should be pulled every few days and cleaned out of grease and dust. Watch for wear on the leading edges of the clutch material. When the clutch driver teeth get pointy or start to round off and look directional like a saw blade, change that before it trashes the chain and sprocket.
The MiniRok is probably my favorite engine ever and is pretty darn reliable once you get in to a routine with them. Have fun with your kid - you’ll look back years from now at this first year and it will be the most fun you’ll ever have in the sport!