Some businesses do rent business premises without legal advice, particularly when they are agreeing a flexible property licence with a reputable landlord such as a local authority. But you need to be very clear about what obligations and potential liabilities you are taking on. For example, you could find that you are liable for expensive repairs, trapped in an inflexible arrangement, or renting from a less accommodating landlord if the property is sold on by its owner.
Having a lawyer check a simple rental agreement will be inexpensive, while getting it wrong can be disastrous. So it is always wise to take professional advice.