Make sure your law firm letterhead and other publications accurately represent your license status in each of the states you list as being eligible to practice in. Other than that. there are no special requirements with the Office of Professional Regulation or the Supreme Court. The Supreme Court licenses individual lawyers, and does not license or register law firms. Depending on the nature of the business form or entity you have used for your law firm, there may be registration or other requirements under the Iowa Code to do business in Iowa, or to do business under a trade name, that are not unique to lawyers. We don't offer any advice on those matters, but you should do your own research or seek advice from an Iowa practitioner as to them.