ok kartik i have read your bio and apparantly you have three mentors you seem to call your "masters" and oooh.. a plus, you are in a coven, why not ask the council or the priestess/priest for help?...i'd imagine they would gladly tell you what to do.
Errr excuse me this guy wanted some help, lets just remember that.
The easiest method for pyrokinesis is to get a candle, and try to put the flame out in your mind =D. Imagine it blowing out, or cold air around, be creative. Once you can get the flame out. You need to try and get it back. The getting the fire out is the "easy bit".