First renewal, Tenant ask for multi-year lease

[Agustin Conti]

Hi, I am ready to renew the lease with a good tenant, He accepted the price increase proposed for the new lease starting in october (very reasonable) but has asked about an extended lease. I don't have a reason to be worried about this tenant and his family as they seem to be the perfect tenants. I want to know what precautions or tips I should consider and how to do a lease myself (and a multi-year lease!). I used a realtor (very expensive!) to get the tenant in, but for the renewal she said I could do it on my own and save the money. I kind of agree with that as the screening is already done and I have a good tenant. All I have to do is duplicate the contract right?  To recap,  my questions are:
How to renew a lease with a tenant without a realtor.
What are the advantages of doing a multi-year lease (2 years, I would not do more), what provisions can be included, and how to do it myself.
the property is located in South Florida.
Thanks!
Agustin