As the winter arrives i am going to put in an order from my hobby supplier to have for next year. i am new to the hobby and am wondering what are things that i should have on hand or what parts commonly break on the Nitro MT

I am going to get various screws, bolts and washers, 2 glow plugs new bearings (I broke one the other day), and e clips, ball cups.

i am looking at a fail safe, and my friend is trying to convince me to get a $20 air filter.

i am just a backyard basher, no racing and tiny jumps, what should i have on hand for next summer?