Renewing a lease (doing it myself)

[Reya Ripet]

Hi, 

My tenants notified me they would like to extend the lease. Their lease expires in February. I'm thinking about doing this myself this time to save money, but I've never done this and feel unsure.
I used a real estate agent with the current lease (who also found them ).

Do I create a template from the current lease and just change the dates etc ?

How is the best way to do this?   

I'm worried about doing something wrong legally.

Thanks.