If vehicle has not been driven in Pakistan, then I think only change of engine oil + oil filter, transmission oil, air filter, AC / Cabin filter would suffice.
No need for extra expenditure, like changing radiator coolant, brakes fluid, etc.
If you have sufficient funds, then you may get these basic works done from dealership, otherwise, any reputed garage would suffice.
First of all, have the auction sheet verified. And if you want added peace of mind, have your vehicle inspected by Pakwheels Cars Inspection services, for figuring out any / all issues.