Glow plugs could be out. Make a note whether the glow indicator comes on. Don't diagnose in front of current owner unless they are a friend.

Non-running had better be cheap. You can't diagnose engine, trans, brakes or anything when it is just sitting.

Check for body damage/paint need/interior. Plan on engine, tranny, brakes, shocks, drive shaft suspension all needing refurbishment unless there are receipts or obvious work done. Note who did the work. Competency (lack of) is a consideration.

How much? Where?

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.