Pyrokinesis cont.
To move heat to higher concentrations, focus on the heat energy.  Think of how heat feels.  Then focus on it going to a different location.  Visualize the area getting hotter, the atoms moving faster, maybe like the numbers on a thermometer are going up.   To make a fire hotter, just apply the same principle.  Move heat energy into the fire to make it bigger.  To start a fire, focus heat on a single point or area, though the latter is harder.  I'd reccomend starting off with a toothpick soaked in something highly flamable (but not explosive) such as petroleum distillates, lighter fluid, or gasoline.  DON'T OVER DRENCH IT! and don't soak anything larger than a toothpick or a scrap of paper in any such fluid, or it could be dangerous.  NEVER try to ignite any such fluid alone, only when soaked up by something else, I CANNOT BE HELD RESPONSIBLE for any damages or injuries you have when trying this or any other feat on my site, as always, make sure you know what you're doing before you start playing around with fire, it's pretty dangerous stuff (as if i needed to tell you that DARN YOU LEGAL PROTOCAL!!!)  To move fire, focus on heating up an area near to the fire where you want it to move.  That should heat it up enough to allow the fire to spread there.
CONTROLLING FIRE (increasing)
MAKING "FIRE BALLS"
Fire balls... possible? no idea! never tried it.  Nevertheless, i know how to make some pretty hot psi/ki balls.  It's just like mkaing any other ball, but this time focus on making it hot; REALLY hot.  Think about it being so hot it burns.  Just be careful that you don't actually burn yourself.  For this reason, you may want to make just the core hot, or keep the ball a safe distance from your skin.  If you somehow manange to get it hot enough to ignite the air, you've made a fire ball.  But note that it's not likely that this will happen.