Welcome and congrats on the purchase!
What kind of tools do you and your son have? Nissan did a great job keeping the number of fastener head sizes to a minimum, so a good set of 10mm, 12mm, 14mm, 17mm, and 19mm double box end wrenches and 6 point sockets will be a great start. A good multimeter is another must have. If you already have a good tool set, get a UniSyn carb synchronizer tool. A good floor jack and jack stands are also must haves.
Other than tools, you can get him things where the car is weak - carpet, suspension bushings, etc.
Most of all, have fun!!!