How do I find out what the child support calculation should be in Florida?

I have not been earning an income for the past 4 months. It's been 2 years since my last support modification. I have not been able to pay my support obligation and they've suspended my license. I got the notice and I responded for a hearing but I got to court late and they already ruled on my case and suspended my license. I'm trying to handle the suspension issue on my own but I need to modify my child support and can't afford to pay for an attorney. My family has been supporting me for the past year and are willing to pay for an attorney for this modification if absolutely necessary. I just have to stop the bleeding as soon as possible before my arrears get any bigger.