Before joining any form of indian classical dance tutorial, just remember one thing: each form is considered divine. If and when you master it, believe me u will experience true sense of divinity(and this happens in any form of dance)
When it comes to kathak, just see to it that your eyes speak what your heart wants to. And your legs and arms harmonize your emotions.
And when this happens, you would be in a state of trance.
Before you start learning, make sure your eyes are expressive.