And the glues and tools needed for putting the plane together!
Glues: 30 minute and 5 minute epoxy, with something to mix it on and with, (old plastic lids and wooden coffee stirrers, plus small plumbers' acid brushes). Thin CA. (Not "Superglue".)
Tools: XActo knife and extra number 11 blades. (Buy a box of 100, it's cheaper and you'll use them eventually.) Razor saw; Kona or XActo. Kona is better. Steel straight edge, 18". A ruler will work but.... Sanding block and various grits of sandpaper. (80, 120, 200, 400.) Screw drivers, small and medium sizes, both flat and phillips types. Pliers, needle nose and regular. (At least one pair with side cutters for wire.) A good set of Allen or hex wrenches. (IMO, Ball drivers are a bit better if you can find a good set.) A "Dremel" type rotary tool will help a lot if you can shell out the extra dollars.
You won't need these right now: Covering tools: A sealing iron. A Trim iron will help too if you can swing both. A Heat gun made for covering. (Blow dryers don't really get hot enough.) More of those #11 blades for your XActo knife if you didn't buy the box of 100.
Check the kit (or ARF) contents. Most will have a list of extras you'll need to buy; like wheels, fuel tank (& size), fuel line, etc...
You already have a flight box coming, and most of this stuff, but....
A gallon of 10% fuel, a fuel pump, manual or electric and fuel line (3 feet minimum),. A glow igniter with charger. Although not 'necessary', I highly recommend a 12 volt starter for the engine, because most new engines are quite hard to start with a "chicken stick", and it’s one more headache you don’t need when beginning.
If you buy a 'self contained' glow ignitor and starter, and a manual fuel pump, you won't need to buy a 12 volt battery with charger, nor a "power panel" to connect everything. (And you won't have cords dangling around your prop when trying to start the engine.)
Also get a few props of slightly different diameters and pitch (in the recommended range). You have 10 X 6's coming, which should be okay, but as was mentioned, you might want to get an 11 X 5 to try. One or two extra glow plugs should last you through the learning process.
Good luck, and have fun,
Dennis-