Hola Manooj
I suggest you to google "Jones stepper motors". The tutorial, maybe a little long for your taste, will help you to get a pretty reasonable grasp of the matter.
To control a stepper, you could do it manually so it advances one step every time you bring one pin of a micro low. Do not worry; too-basic as it looks, is the best. After doing that test, I programmed a micro able to accelerate, going back a forth as required and of course, stop as well. I even used garden variety transistors.
I recall "seeing" you before. Kind of a Ritesh-like recollection.