You'll change gearing dependent on motor turns, equipment temperatures (ESC and motor) and track size.
The car manufacturer will (usually) state a recommended pinion size or overall gear ratio for each motor turn (given that you still have the stock spur gear). That's usually your best starting point.
You might go up a tooth for a big, open course with no/few tight turns, you might go down a tooth for a small, tight course with lots of acceleration from almost stationary (indoors for instance).
Then you might also choose a smaller or larger pinion depending on how hot your electrics get, which is dependent on how you've set up your ESC, boost/turbo etc, How much grip you have, and how you drive.
Best off actually speaking to someone at the club to get some advice which is better related to the track you are driving at. (How big is it, what tyres are common, what surface is it and so on)
But also worth having a small selection of pinions (4 or 5 maybe?), and possibly a couple of spur gears to play with, this will give you a nice range of gear ratios to play with, and it's not like they are expensive.
An IR temp probe might be worth investing in too.
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