I agree with Chad_40
Use the link to overclock.net that he posted. Very good info there on what to do and how to overclock the kabylake cpu`s.
Use HWmonitor to watch you temps, Voltages, etc.
Use Aida64Extreme (no you dont need the full version) to stress test the system for stability.
If your CPU hits 80 - 85 degree celcius I would recommend you to stop since its getting pretty hot.
There are ways to deal with the high temps that alot of 7700k`s are troubled with if you are unlucky and get a toasty one. But its a risky rute to take since you could destroy your CPU and have to buy a new one.
I did it since my 7700k was a bad one when it came to temps. I was running 90ish degree celcius when it was at stock settings.... Very very bad
So after a delid to swap out the stock intel thermal paste to liquid metal + bringing the IHS as close as possible to the CPU die... My temps are alot nicer
Mine is running 5.1GHz 24/7 @ 1.328 Vcore and during idle I stay around 19 - 25 depending on ambient temps. Gaming I see around 40 - 52 depending again on ambient air. Full out stress test like Prime95 and Aida64 I never ever go over 62 degree celcius.