They are Mode One and Mode Two. This refers to which sticks look after the various controls of the helicopter. Mode one is when the left stick controls the fore/aft cyclic and the rudder controls. The right stick controls the collective/throttle and left/right cyclic. Mode two is when the left stick controls the collective/throttle and rudder controls. The right stick controls the left/right cyclic and the fore/aft cyclic. In New Zealand, Mode Two is the more popular layout. However, it is important to get the same layout that the people who will be teaching you use. That way they can fly your machine if need be.
Receiver
If you purchase a new radio set, you'll most likely get the corresponding receiver with it too. The receiver just act's upon the signals the transmitter produces and commands the appropriate servos/gyro etc accordingly. There's not really much more to say about receivers.

Servos
Servos are the little gadgets that actually do the work in the helicopter. They move the little arms that make your helicopter move. You can get all types of different servos. The difference is mainly in the speed of the servo (transit time) and the amount of power it produces (torque). When you're first beginning to learn and you're not thrashing the helicopter round, basic servos that come with your radio kit (such as Futaba 3001's etc) will be fine cause you're not putting them under large loads. However, when you start throwing your machine in around, or if you upgrade to a larger machine such as a 60 or a gasser, you'll want to upgrade your servos to a higher torque. There are also two types of servo, the Digital servo and the non-digital. Digital's are designed to center more accurately and also come to full power from stop. Non-digitals are less expensive, but some do not center as accurately, and also don't have full strength in minute movements.

Batteries
Your radio set will often come with a battery for the electronics in the helicopter. A lot of them are around 1000mah. These are fine, but you might want to consider upgrading to a larger capacity in the future. Some gyros and servos really chew up battery time. 1700+mah batteries are good, allowing you to fly pretty much all day with high capacity servos and gyros without having to recharge.

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