You say you want a reliable car.
You need to know the things that fail and can leave you stranded and replace them.
The entire cooling system, fuel filter, and fuel pump and good things to replace right off the bat. A lot of things can go bad but these things will leave you stranded if they fail.
There are various other things that will probably need replacing on a high mileage car like that but other things like bushings and such can be replaced as they fail. No need to replace them before hand because they will not leave you on the side of the road if they fail