Re: liscensing
All states do not have licensing requirements. For instance, Indiana has licensing requirements in some cities and not in others. It is up to the state as to whether or not to have state wide licensing. Look for the state you are interested in and browse that site.
Someone may have a breakdown of the state by state requirements but I don't remember seeing it if it exists. someone will now post a link and I will be having a bite of crow.