thermal paste and overclocking

[Gaming4Life]

Hello,
Im a noob to overclocking and i really would like some info on how to overclock, what cpu cooler would be recommended that is under £40 and do i need to buy thermal paste if i overclock?

Thanks for any advice

 

[Gaming4Life]

Ok thanks ever so much, I'm using a i5 6600k and want to get a 10% over lock on it