After assembly of hardware?

[prithvibm]

Given that I've assembled all the hardware needed(mobo, processor, gpu, ram, power supply) what do I need to do next? How do I istall an operating system and connect the display to the right out of source?
Pls help I don't know much about this!!!

 

[herrwizo]

Here is a good guide:

http://www.tomshardware.co.uk/forum/274745-31-step-step-guide-building

Start reading from step eight.

In general, you must first ensure that:

1) You have at least one hard drive or SSD installed
2) That the computer turns on, passes POST and outputs image on display

You need either a DVD containing your OS, or previously prepared bootable USB stick with OS. Using boot menu in BIOS, you select that device to boot first, then follow the instructions on screen and install the OS on your hard drive or SSD.

Afterwards you need to install drivers, and then the applications you need, as usual.