As the responsible person of a business you must carry out regularly review a fire risk assessment of your premises.
You are required by law to keep a written record of the assessment if you have 5 staff or more but it is advisable to do this even if you have less as it will help you identify the hazards and risks within your premises and implement control measures.
You will need to consider the following as part of the assessment
Emergency routes and exits
Fire detection and warning systems
Fire fighting equipment
The removal or safe storage of dangerous substances
Emergency fire evacuation plan
The needs of vulnerable people, for example the elderly, young children or those with disabilities
Providing information to employees and other people on the premises
Staff fire awareness training
Overall fire safety management
You can do the fire risk assessment yourself but it needs to be suitable and sufficient so if you are unsure it is best to employ a professional fire risk assessor to carry out the assessment on your behalf.