Always use Bios to overclock. As for trying to overclock each CPU will be different this is referred to as the Silicon Lottery.
As to preferred settings id look into overclocking forums that are already on here. there are no starting point if you will just steps to increase the Clock speeds then testing them for stability. There are many overclocking guides on you tube for your CPU.
Take a Look at this http://www.tomshardware.com/answers/id-3446071/ryzen-1700-stable.html