coaxial- 2 rotors, one on top of the other, no tail rotor. very stable, once you learn a bit you can hands off hover the thing.
fixed pitch single rotor- it has one main rotor and a tail rotor. the pitch of the blades doesn't change, to adjust lift you increase or decrease the throttle.
collective pitch- single rotor with a tail rotor. the pitch of the blades change to increase or decrease lift, rotor rpm for the most part will stay fairly constant.
just want to confirm with you guys, all the blade helis have the same controls, they are all minimum 4 channel helis. your throttle/pitch, rudder, elevator and aileron are all the same, they arent like the cheap toy store 3 channel crap. they may not be the best to learn, however after 10 years of cars the mcx2 and msr taught me the controls. real flight didnt work so well for me for that, i found its hard to concentrate properly on learning when you are staring at a screen, at least at first. learning with something in front of me making noise and wind allowed me to learn the basics of a heli. no it doesn't transfer over directly to my blade 450, however at least when i have it hovering i know what control does what 2nd nature.