I forgot to mention CG.  It doesn't matter much, particularly when the lines are attached near the leading edge of the wing and there's 5 or 6 degrees of incidence in the wing relative to the stabilizer.  This is a good thing because you don't have to add nose weight!  You can build it however you want.  I find that with my foam-filled nose pieces, the CG  comes out about 50% of the wing chord. 

If you tune a plane for high performance, with relatively rearward line placement and 4-5 degrees incidence, the CG has a more noticeable effect on the flight performance.  Rearward CG makes the tail whip around more in turns, while forward CG, like on a free flight plane, seems to make the kite more stable and smooth tracking.

I'll try to get some video of launching, but it may take a while.  Launching is one of the trickier problems in flying these.  I think the difficulty comes from trying to throw the kite like a glider.  Think about what you want the kite to do:  start lifting and pulling itself against the lines and forward using the wind power.  If you throw it, you supply the power, and that power combined with a lot of incidence in the wing or up elevator causes the plane to pull up and bounce off the lines and into the grass.  The trick is to gently let the plane get going on its own with the lines taut.  Luckily, the planes seem to survive launch problems pretty well.

The handle should be about as wide as the distance between the line attachment points on the bottom of the wing.  I have a 9" handle and an 11" handle.  One's a 3/4" dowel and one's  a rectangular stick.  Sometimes the bigger one is an advantage when a plane won't turn easily. 

I hold the handle vertically, as in control-line.  I'm curious as to how a flier without control-line experience would hold it.  Most kite fliers who use a bar hold it horizontally with two hands.  That would probably work, but it seems like one-handed flying allows for faster reaction time.  I wouldn't try it with those straps that kite fliers use, one in each hand, because the control movements are too small and over-controlling could be a problem.

Models can be flown as high-speed kites.  Why do this?  It's fun.  It's different.  It may be a better alternative for some kinds of models, such as models of airplanes that are streamlined and fly fast.  And actually, kites are very simple, with no moving parts such as motors, control surfaces, wheels, etc.  They aren’t big, because when they fly fast, they pull hard.

How do they work?  Think of a kite line as replacing gravity as one of the forces acting on the model.  Wherever you attach the line is the equivalent of the CG on a free flight plane.  On small, hand-flown models, two lines attach to tabs on the bottom of the wing  between the leading edge and the high-point of the rib camber.

Another force acting on the model as it flies is the stabilizer pushing the tail down so that the wing flies at a high, but not stalling, angle of attack.  Without this down-force on the tail, wings like those on airplanes are hard to stabilize.  Of course, having a tail with an elevator and rudder looks normal on airplanes,, but kites such as deltas or parafoils don’t usually have this aerodynamic stabilizer.  They rely on bridles that hold their wings at a stable angle of attack relative to the line.  Sailboats use hydrodynamic forces to keep the sail moving at the best angle to the wind. For built-up models, though, an airplane-like tail works very well.

Now we get to the wing.  It’s going through the air at the highest angle of attack that it can maintain without stalling.  Sounds like a freeflight when gliding, doesn’t it?  That’s right, except that the lift that it generates isn’t just enough to hold the plane in the air, it’s being used to move the plane forward, like a sail moves a sailboat.  And the amount of lift created increases as the square of the wind speed.  This means that when the wind blows a little faster, the wing creates more lift.  This extra lift pulls the plane forward, increasing the speed of the wind hitting the model, or apparent wind.  This extra wind speed then creates more lift, and on and on. 

Of course, there is another force acting on the model, drag.  Most drag comes as a byproduct of lift, so the wing is the chief culprit.  The better the lift to drag ratio of the model, the faster it can go.  This is why airplane-shaped kites can go much faster than conventional deltas or parafoil kites.  An airplane, even a small model such as a 2-3 foot span P51, has a lift to drag ratio perhaps twice that of a parafoil or delta kite, so the airplane-shaped kite will go much faster, since for the same amount of lift generated, it has only about half the drag.  Since the lift increases as the square of the wind speed, and the lift to drag ratio remains constant, small improvements in L/D result in big increases in speed.