Good choice with the radiator dear @muhammad.irtiza I personally don't prefer or recommend kabli radiators but this one is in neat condition should work for a couple of years.
Also I you haven't installed the T-stat yet get it washed properly... These T-stat are available new at Plaza.
Now the things to check for after the rebuild. Air in the cooling system, oil residue in the cooling system, monitor the temp guage and check for any leaks from the radiator, hoses, water body, water pump etc... The system should be pressurised.
You Kabli radiator fan hai setting for slow and fast depending on the temperature and the use of AC check that it is properly connected..
Also from where did you get this radiator...
And what is the total dent on your pocket for the whole Job.
I am still a bit skeptical about the condition of the Kabli T-stat Bhai.. keep an eye on it.