Im 5'10 i weigh 140 n im looking for a dirt bike for the trails and im a beginner.?

i would like a Yamaha but w.e u think is better for me is fine. so what size bike should i get i was think a 125cc or a 230cc but i dont no.Im 5'10 i weigh 140 n im looking for a dirt bike for the trails and im a beginner.?
Go with a four stroke 230cc if you only want to hit the trails; a two stroke 125 are to noisy and are illegal in most trail oriented parks. However if you want to hit real jumps you will need more power, like the 125. You could buy a 250 four stroke, but they are more advanced and not for complete beginners.Im 5'10 i weigh 140 n im looking for a dirt bike for the trails and im a beginner.?
i think that you should get a yz250f because it has the power for the trails and if you want to get a little crazy it has the power and capability for that as well.
A beginner your size should have a 4 stroke between 200 and 250cc. Go with a Yamaha TT-R 230.