Getting seperated is never easy for a child. My advice to you is three fold.
1. Always try to be positive about dad and the situation no matter where your son is. As long as you focus on the positive you will be able to say the best things around your son.
2. Do not be affraid to get help. Counseling, Legal help, Mommy time out. As mother's we often get caught up in the super mom, I can do anything and half to do everything and we do not!
3. Make sure he is fair. If you have your son more than 50% of he time, he should be offering you financial help. Medical expenses, day care expenses, school as he gets older. Be fair as well. He should be allowed to keep him over night, weekends and mid week. He should be allowed to pick him up from school and feed him dinner. As long as the 2 of you communicate and are patient with each other, you should not need court. Revert back to #2 Do not be affraid to get help if you need it. FL is very serious about Father's paying for there children. They will garnish his wages, take his driver's license, whatever is necessary.
Good Luck and try very hard to be postive.