You should not take advice of a layman. The first step towards your spouse becoming a U.S. citizen is for him become a lawful permanent resident (green card holder). All family-based immigrants must show they will not become a public charge. As part of the process, an affidavit of support will need to be filed. If you do not make sufficient income, your spouse will need a co-sponsor.
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In order from you spouse to get his LEGAL PERMANENT RESIDENT CARD, he needs a sponsor who meets the 2013 HHS Poverty guideline (I-864P). Citizenship is not equal to LPR card. Your partner can apply for the citizenship LATER when he gets LPR card.
Bottom line. You do need a co-sponsor if your income does not support the requirement. You do need to talk to an immigration attorney because you will get confused when you take advice from lay people. Immigration law is very statutory with very complicated/unclear language.
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You do not need a sponsor to file a family-based petition, but you will need one for your spouse to be able to adjust to the status of a permanent resident. If you do not make enough, you need to find a co-sponsor.
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