As you said "outdoor" the above comment does not apply.!
I would say astro turf every time ....dirt tracks need too much maintenance IMO
Size would need to be something like 30 x20 metres.
Jumps , table top, sleeping policemen, banked curve...gradients, if possible.
25 miles each way ..
Most important is parking, electricity, toilets....on site food /drinks would be good.
Good luck..
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