Hi and welcome Al Noman JIKU , if you want to learn programming and don't know how to start, then you might want to take a look at the FAQ for beginners :)
I want to learn programming for having a good job. Also want to impress only myself, because I am in war with myself.
For creating an Application with coding, what should be my first step???
Al Noman JIKU I can only repeat what I already wrote into the FAQ. Find a project which motivates you and start learning with that. That project will dictate the first language. Don't be scared to set a too high goal. And then it's just practice. Keep working on the project. Get training material for the language you selected and use anything you learn to build your project. Never stop learning. Do a little bit every day and make it a routine to write code.