about the motor , you will need a os 46 ..Get the motor first break it in .. before you start on the head.. a good os32 would get it off the ground butt who wants to fly a Brick any way .. you need the power to get out of trouble.....
the blades for a multy head is smaller than 2 blades .. thinner..
Century make a good scale kit with helis .... I would get one of them to start with ..... bell222 is only $369.00