Then yes, you would file in Arizona. From what you have described, it sounds like you may have two separate issues, enforcement and modification.
As to enforcement, I mean getting him to pay the monies that are already owed. This would be a relatively simple process and could be handled by filing a motion with the court. The motion would describe what monies have not been paid and then make a request for an order to have him make reimbursement immediately.
As to modification, I mean changing the custodial arrangement, the amount he pays or how he pays. This would be a bit more involved and would require that you show that there has been a substantial change in circumstances such that the modification should be granted. The substantial change could include his move to another state, spending less time with the children and/or failing to abide by the current order anyway.
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Enforcement - Your clerk of court likely has template documents for just this purpose. Just contact the clerk and ask for a motion for contempt and enforcement for a family law case. And yes, they may have it available online.
Modification - You might consider filling out the information with your best guess at this time. As part of the process, you are entitled to obtain all of his financial information, this could include paystubs, tax returns, bank statements and the like. Once you have those things, you can better calculate the support obligation.
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