Simple ... income is zero.
Total your expenses and assets for the other boxes.
Franco Capriotti - Senior Immigration Counsel
CAPRIOTTI INTERNATIONAL LAW
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IMMIGRATION LAW PROFESSOR for 10 years -- LEGAL DISCLAIMER: This answer is offered for informational purposes only. It does not constitute an attorney-client relationship.
Don't forget to explain your economic necessity for a work permit. USCIS could question whether you really "need" to work if you are still living with with your parents or other relatives, so it is important to explain your reasons for needing to work apart from just showing your expenses are higher than your income.
Ms. Doerrie's answer to your question is general in nature, as not all facts and circumstances relating to the specific person(s) and situations involved are known to her. Ms. Doerrie recommends consulting with an immigration attorney regarding your specific facts and circumstances prior to making any legal decision or submitting any form or application. This response does not constitute legal advice or create an attorney/client relationship.