Well, As mentioned above, install the card, Make sure the monitor is plugged into the new card, Windows may install some generic drivers or an older set of Nvidia drivers, You will want to go to Nvidia and download the latest drivers
https://www.geforce.com/drivers
You should restart the system afterwards just to be sure everything applied, 1 thing I normally do is I right click on the desktop and click on Nvidia Control Panel, Manage 3D settings, And I scroll down till I see Power management mode, and I select Prefer maximum performance.
After that Install some temperature program and see how hot the card is just to make sure everything is working as it should
https://www.cpuid.com/softwares/hwmonitor.html Click on Setup . English or well whatever language you prefer.
Then I run a 3D app, I like to run Heaven Benchmark for a while to see if the card is stable, best to find out now while you can still return the card if it has a problem, Anything that uses the GPU should be fine to stress test it, I normally turn it on when I go to bed or leave work and leave it run over night and by morning if its still running and temps are good then that normally means its going to be stable.
https://benchmark.unigine.com/heaven
I run a PC shop, and these are the normal tools I use just about everyday, some of these new or used graphics cards are tested for days sometimes when we build a system, just to make sure everything is ok and ready to be sent to the customer or displayed on the floor.