If you are past the time when your ex was supposed to file a financial affidavit, give you pay stubs, etc., then you can estimate your ex's income on the guidelines worksheet. Estimate really high and watch your ex suddenly file a financial affidavit and comply with mandatory disclosure.
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Estimate his income.
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You can't calculate the support without estimating the other party's income. I like Attorney Rose's strategy.
The contents of this answer should be considered friendly advice, not legal advice and the answer should not be construed to constitute an attorney-client relationship. If you'd like actual legal advice, call me at 954-567-4100. Also, if you liked this answer did, be sure to click the thumbs-up button