Legal Question in Immigration Law in Florida

Different law firms charge different prices, so you would need to contact individual law firms for quotes.

Usually consular processed cases (like yours) cost more than adjustment of status cases filed in the U.S., because they are more of a hassle, more involved, more labor, etc.

Most people can file for citizenship on their own, so you shouldn't necessarily need an attorney for that.

Attorney fees vary. A lot will depend on the specific facts of your case (eg. does he have criminal arrests, has he overstayed his time in the US before or has he ever had a final order of removal issued against him, has he been previously denied residency?)

Likewise, if any facts change after his period of residency, this may affect his ability to and/or the difficulty in obtaining his citizenship.

Schedule a consultation with an attorney who can make more specific inquiry and provide a detail outline of work and fees tailored to your case.