What are the steps and fees to marry my fiance who is an immigrant?

Significantly more information is needed in order to provide a legal analysis of immigration-related eligibilities for your fiance of the steps you and your fiance should take, and of the fees and expenses for the steps that should be taken. It would be wise for you and your fiance to consult with an immigration attorney who, after learning all of the relevant details, including information about how and when your fiance entered the U.S., about any immigration application history for your fiance, etc., then could advise about immigration eligibilities, options and strategies and could offer legal representation in the often quite complex application process. Some immigration law firms, including mine, offer legal services on a "flat fee" basis so that a client will know the total expense from the very beginning, and a few immigration law firms, including mine, offer an initial consultation free of charge.