There are plenty of commercial entities that can be established in Ajman. Based on your wishes and business needs and activities  you may select one of these entities:
  •  Business company
  •  Joint-liability company
  •  Limited liability
  •  Foreign company branch
  •  Service agent 
Despite of your business activity ( commercial, industry or professional)  you need to follow same procedure to get licensed:
  •  Approach Ajman Municipality to start the process
  •  Fill required forms, provide required documents and pay fees
  •  Civil Defense - site inspection
  •  Activity might require federal approvals  , check this list