Change the fluids/filters, make sure it doesn't have overheating issues, check the driveshafts (front in particular) for play as they are not field serviceable and must be replaced with a different style that is or removed and replaced with new. Go through a carwash and check for leaks, seal those up, check for electrical faults, check for play in driveline, if it has the linkage for the centre diff lock work that and make sure it isn't stuck or inoperable.
They typically have headgasket issues that come from people overheating them, motors will leak pretty much every fluid a little bit. Driveline has some play usually, electrical faults are common especially CEL/ABS/Traction control failing together.
for $500 not bad. They are ok vehicles, not the best that LR ever built, but serviceable and liked.