My question involves a child custody case from the State of: Florida

Hello. My exhusband filed a petition to modificy his parental responsiblity, visitation and parenting plan/time sharing schedule in November of last year. I in turn filed a response with the court w/in 20 days, as the papers instructed. I recieved a packet from my ex-husband, sent via USPS priority mail on or around December 7th, 2012. I have not sent another response as of today, but just realized that I may need to. There hasn't been a court/trial date set as of yet, so should I request a court date so that we can go before a judge to resolve our issues, or do I need to file a written response, to his response, to my response from his original petition? I feel like we are just going in circles with paperwork, but nothing is getting resolved. Since this last round of documents was delivered to me via USPS priority mail, is it too late for me to send a written response via the courts? Does this mean that whatever my ex-husband put in the last round of papers, the judge will automatically approve?

I will list the disputes that we have:
My exhusband voluntarily quit a job locally and moved 4 hours away for a job that pays less. Our current visitation agreement is that I am the residential custodial parent, having my son except from end of school on Wednesdays until 9pm and from end of school on Friday's until 9pm on Sunday nights, every other weekend. My ex-husband randomly took his visitation when living here, but now, of course, isn't seeing his son on a weekly or every other weekend bases. Additionally, our decree states that on certain holidays, our son is to be with his father. During this last Thanksgiving and Christmas break, my ex-husband tried to force me to be out the expense and time of getting my son to and from the airport for flights that I didn't approve. (BTW our son is 13 years old and I am not in agreement that he should be traveling alone) Our current agreement states that my ex-husband is responsible for picking up our son and returning him to my residential home, not that I'm responsible for taking him or picking him up for my ex-husbands visitation.

Additionally, in our current divorce decree, my ex-husband agreed to establish and pay for a 4 year pre-paid college fund. He started this, but then within a year or so, my ex-husband liquidated the account and never reistablished it. In my original response to his November petition, I asked that the court insist that my ex-husband re-establish this account, as my son is due to start college in a little over 5 years.

There are other matters, but my main issues are with new visitaion schedules/procedures, child support modification (since I now have my son almost 100% of the time and my ex voluntarily quit a higher paying job to move away from his son and make less money), and the college pre-paid account.

Your assistance is greatly appreciated. BTW, my ex-husband and I both live in Florida.