Basically, in order to prove that a tenant has damages property in which he resided, you will need either:
1. a detailed entry inventory (preferably with photographic evidence and date stamped) of all items in the property plus their condition and including details of all flooring, walls, woodwork etc. This should have been signed by the tenant that it was an accurate record of the property.
This must be followed up with an exit inventory which would show any difference between the entry condition and the exit condition.
2. If any of the property was new or newly redecorated immediately prior to the commencement of the tenancy, invoices and/or receipts for same which will indicate their condition.
As has already been stated, you must go through the PRTB process with tenant related claims and not the SCC.
However, if the tenancy was not registered with the PRTB, you cannot make a claim with the PRTB where your initial action must be. If the tenancy has already ended, I believe that it is not possible to register it. However, if the tenancy is still in existence, you will be able to register it on payment of a late registration fee.
You will also need the tenant's current address so that documentation regarding the claim may be sent to him.
I would suggest that you go to the PRTB website and read plenty of Dispute resolutions and tribunal adjudications to see how and why cases were won or lost especially as to the kind of proof of evidence required.