Which profile should i use in nrf51822 for low power consumption?

[ashwin_mk]

Also it would be helpful if i come to know how should i use it with sample codes.

[MartinBL]

Your question is very vague. I suggest you do as @Punitc suggests. Also you should check out the tutorial section here on devzone. There you will find some guides on how to get started.

Here you will find the SDKs.

Here you will find documentation on the SDKs and the nRF51.

When you are ready to save power, you can have a look at this great current consumption guide.