Try meditating on the element first, try to attune yourself with its energies and then work on from there. I've worked with fire spells before, but I believe you are asking about actually bending it to your will so to speak. I've never done this, but I'm sure once you start working with the element it would come easy to you.
Try doing as I said above with a candle flame and then visualize the candle flame doing what you want. You'll have to work with it a bit before you start to see any results. I hope this helps.
Merry Meet and Blessed Be.