okay, some things to be aware of.
be VERY respectful to your ex and to the GAL (if one is appointed by the court for your son), also to the judge.
Remember that you are the one asking to relocate, so you will need to be very agreeable to all the things that are suggested.
You don't mention the age of your son, I will assume that he is use to stay overs with dad.
things that will be considered by the court...
the father has jointly raised the child - 50/50, it's your word against his, that he hasn't.
all of your family is there, you will be pulling him away from grandparents, cousins, aunts, uncles, etc...his family unit.
now, the reasons. why do you want to relocate? is it a better job? new love? what are the reasons? they will have to be good to pull the child away from his father.
you should also be prepared to bare the costs of ALL expenses for visitation - after all, it is you that wants to move.
you should be prepared to basically lose your child for the entire summer. because the biggest majority will be spent with his father, along with most holidays when the child is not in school.
you have to offer a visitation schedule that will allow the same - prefer more - time with the father. if he is joint physical and you have a 50/50 split. there is no way possible to match that with holiday and summer visitation.