L.P.
My first priority always, and especially I'd think in the case of a divorce is to ensure the health, safety, security, and physical/emotional well being of my child.
That, however, encompasses a number of different things that would need to be addressed, including but not limited to the following:
Finances - so that my child can continue to have a roof over his head, food in his belly, and clothes on his back.
Custodial issues - ensuring that my son is and feels secure in his custodial situation, whatever that would be determined to be.
Stability - making sure my son has as much stability as possible during this confusing and unstable time.
Love - making sure my son continues to feel abundantly and unconditionally loved.
After that, I'd do my best to make sure that I'm ok, that at least my basic needs are met, so that I can be a stable and loving mother able to provide for my son.
Anything and anyone else comes after those things, I'd think. My son is 5, btw.
It would be a little easier to address your specific question in a more meaningful and appropriate context if we had a little more information from you regarding your question...