Hey I am wanting to join enduro racing with a dirt bike and I was wondering about the rules and regulations?

I really want to join enduro racing which I am really good at trail riding and blaze past my brothers and my dad raced dirt bikes but not enduro and i bet if i pay for it he will let me join I need to know the rules and regulations of enduro racing im 13 and I want to ride a crf150 trail bike that hauls *** I think it would be good for the job will someone give me the age groups of racing and the regulations. I am 13 and live in durango colorado help