Financial solvency is not required to be eligible for U.S. citizenship, though you must be legally eligible for it. Naturalization requires a showing of good moral character, so do not misrepresent anything in applying for financial assistance. Also, be sure to comply with all tax filing requirements. But to obtain lawful status for your husband, you'll need to demonstrate an ability to support him on Form I-864, or you will need a joint sponsor. You should consider having a consultation with an experienced immigration attorney or agency that is authorized by the Board of Immigration Appeals to provide counsel and services to immigrants.
Scott D. Pollock