I would think in a town the size of Eddyville (been there many times born and raised in Corwith IA worked in Garner) you wouldn't need much. I do know IA is quite strict on the Tax things and they do check for that stuff quite often. Most importantly have insurance license or no that will get you in a big trouble if something goes wrong. Call city hall they will have the answers you are asking us for. I know out here in Cheyenne you have to have your ISA arborist certificate to run a business not to do work but to run the business so if you are a one man show like me that means you must have your certificate or no tree work for you.
Jared