Believe it or not, you need to check carefully that the aircraft is fully up to date on mods, SBs, etc; I've been involved with collecting new US-made aircraft (not from Cessna, other end of town) where this had not been done.
Your NAA may require other mods to be done, expecially for Public Trabsport category C of A.
As the previous post says, this is not a job for amateurs.