What PSU and cooler should I use?

May 30, 2018
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Setup:
CPU: Intel Core i7-8700K
GPU: Asus ROG Strix GTX 1070 Ti
Mobo: Asus Prime Z370-A
RAM: Corsair Vengeance LPX 16GB (2x8) x2
HDD: WD Black 2TB
SSD: WD Black NVMe 256GB
ODD: LG BH16NS55R BD-ROM
Case: Fractal Design Define R6 Blackout Tempered Glass

It is a gaming system. I want to overclock CPU, RAM and GPU.

Questions:
1. What frequency can I get out of overclocking the CPU?
2. What specs for my CPU cooler will I need with that OC?
3. How many W do I need for my PSU?