what type of electric rc airplanes are available and which one to buy for a start?

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References :
me i am my only source

Electric rc airplanes come in different shapes and sizes like powered sailplanes, aerobatic models, scale models and ducted fan type. The types of electric rc airplanes with respect to option given for maneuvers with respect to radio controls called channels, more channels more options you have to maneuver your electric rc airplane. Check this link for more detail:
http://rcjet.blogspot.com/2009/03/electric-rc-airplane-your-first-option.html

First one 2 channel electric rc airplane, simple and easy, only yaw and pitch controls are available with 2 channel electric rc airplane. This one is great for very initial electric rc flight as 2channel electric rc airplane comes really cheap. Then we have 3 channel electric rc airplane, which gives you controls over yaw, pitch and altitude of your electric rc airplane. The 3 channel electric rc airplane is good for occasional flyer who wants a better control over their electric rc airplane and still keep a not very heavy load on the pocket. Well the 4 channels electric rc airplane is what a real enthusiast require, this one offers full control over the yaw, pitch, bank and throttle acceleration.
I will suggest you to go for a 2 or 3 channel piece to test the waters.
References :
http://rcjet.blogspot.com