You would be best served by investing in a detailed consultation with an experienced Immigration Attorney. The money spent now may be well worth it in the long run. Many, including myself, will do telephone consultations, As Immigration is Federal law you can speak with any qualified attorney.
You can marry someone without immigration papers if you are not already married but you will not be able to help your spouse legalize his status if they entered the US unlawfully.
You can marry someone who does not have immigration papers. Check with the place where you are planning to get marries as all Cities have different rules for this. If you are seeking to get papers for that person the case may require that you obtain a Provisional Waiver. This can be complicated. You should consult with a qualified Immigration Lawyer to discuss how to do a case like this for your future spouse.
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