Rental contract

I am a landlord planning to lease my apartment for rent, unfurnished. I have some queries on this regard. Hope some of the experts can me help me on them.

# (q) In the event of signing a new rental contract with a tenant for a standard 3-6-9 lease contract, Is there a new law that it needs to be registered with the notary?

# (q) If answer is yes, any idea how much does it cost for the registration procedure?

# (q) Who has to bear the registration cost with the notary, landlord or tenant?

# (q) What are the legal implication if a contract is not registered with the notary?

# (q) What are the benefits of registering a 3-6-9 lease contract? (From landlord and tenant perspective)

# (q) Are there any type of rental contract types which doesn’t need to be registered?

# (q) Is there a deadline by which the signed lease contract needs to be registered?

# (q) Could somebody point me out from white Belgian site can I download a template in French for a standard 3-6-9 lease contract please?