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I am sorry to hear about this situation. It would be smart to get employment prior to filing for custody. The Court decides on custody based on the rule of thumb of "best interest of the child." This includes, but is not limited to, general stability of the parent, financial stability, indoctrination of the child in the current school and environment, household condition and living condition of the child, other persons living in the house, etc.
If you wish to become the managing custodian, the Court is going to want to see that you can take care of the children financially aside from any child support you may receive. So having employment lined up would really help this.
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