Yes. I'll go along with Lawrence. You have a nice set of work on Behance. What skills do you have so far Aby? Do you have other Adobe applications? You really need Illustrator, and probably Indesign, (again as suggested by Lawrence). I am not sure about suggesting a book because graphic design is such a large subject, and goes way beyond just knowing how to use the applications. In my experience, having the ideas is the most important starting point, as that will give you focus on what you need to learn. It will also hard wire it into you, in a sort of use it or lose it way, because so much of what you learn in a linear fashion from a book, is going to be forgotten a week later if you've had no need to make use of it.
Unfortunately, this means lots of frustration and pulling your hair out in the early days, but once you get into it, you will start taking it in really quickly.
For Photoshop, I'd recommend all of the Steve Caplin books. These are How to Cheat at Photoshop, 100% Photoshop, and Art & Design in Photoshop. Steve also has a more recent book called '3D Photoshop', which I have not got round to buying yet, but How to Cheat, and 100% are must have titles for a Photoshop illustrator.
What sets Steve apart from other Photoshop authors is that he is constantly employed by the world's media to create illustrations for newspapers and magazines.
I'll also agree with Lawrence about Lynda.com. Look for titles by Nigel French (I love his Photoshop for Designers - Type Essentials). There are also some good titles on logo design.
I don't feel qualified to recommend books on Illustrator and InDesign, but there are forums for those apps.
Good luck and I hope you make it.