There are lots of factors which will affect your decision, such as the level of risk involved in your business and how this could affect your personal assets, as well things like other income you might earn, or if there will be other people involved in the agency.
Your accountant can explain the requirements for each type of structure and how these might impact your particular circumstances, to help you make your decision. If you do decide to go ahead and register a limited company, your fee will include us taking care of the incorporation process for you!