gearing

i was wondering i am new to 4 strokes i just got my 03 crf450 and i love it so far but i was wondering if anyone has a suggestion on what gears to be in and if there is any different gearing to use i am going to race some arenacrosses and some supercrosses and i want to know if nayone else has raced alot of indoor races on one, and what kind of gearing they used.

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