You and your landlord can write these things yourselves. Take your time and make sure your words say what you mean them to say. Having a witness is a good idea, but is also not required. Keep your papers in a place where you can find them and read them. If you have any questions or problems in the future, you will need to read them and go by what they say.
Many tenants feel they are in a poor position to argue over provisions in a lease.
Unfortunately, this does still happen. However, this will not change until the unwilling landlords learn that to get and keep good tenants, they must not fear negotiated agreements when requests are reasonable. There ARE other places. Besides the terms of the lease or rental agreement, a landlord may have a list of rules and regulations. The landlord is required to notify you of them before your rental agreement begins.