Well ... I use photoshop frequently to add watermark to the photos. In these days that's what I learned from my self practice.

But now I want to make a logo regarding my websites. I will be highly obliged if you guys will tell me step by step.

Its very hard to explain here you must find on internet logo tutorials, you find hundreds on google .

This is very good website which explains how to create a logo:http://logotutorials.com/tutorials.php, you just need to click on the logo which you like and then you will find tutorial how to create it !!