My question involves child support in the State of: Ohio

I'm on the giving end and struggling to make my child support payments. Here is the full story:

My child support order went back to the date that my kid was born. The first two months the amount around $475 then I had a court date and they increased it to $585. So the next four months would be counted as 585x4. The CS court order took place in the middle of the year and that's why I have arrears. My questions is "does arrears earn interest like a credit card even when a court order was not given?" If so, what is the interest rate of those arrears? I have been paying the other 6 months normally.

I was order to pay the full amount in 30 days, which is clearly not possible. Also, they raised my child support amount to $716 because of the arrears. I made my calculations and I will pay off all my arrears in about 3 years. I would like to extend that because the amount that I was paying 584 is extremely high for me. How can I do this? Is there any sort of payment plan that I can enter?