Do I need to start a company in order to offer a service?

I will eventually want to start a land surveying business. However, it will take me two more years to become licensed. In the meantime I can offer one service without a professional license. My plan is to create the 3D models for the machine control that heavy equipment machines use. The construction industry is evolving in the way it utilizes technology by the incorporation GPS navigation for its excavators, dozers, etc. The 3D models I create and sell will be a template of the construction that the machines software will use to guide the machines in cutting out or filling in the dirt to bring it to finished grade.