pt.1 : wai go or radio co.
pt.2: I saw it on wai go HKD2,380(sp) . it go with main body, control, charger, 1 battery and some spare blade. i guess the master in wai go will help you(maybe not).
pt.3: i don't think you need to upgrade the heli.
pt.4: it is better to buy spare blade for future and the battery only fly 15min. continous and it needs
charge about 1-1.5 hr. so it is better to buy one more battery.
pt.5: i don't know yet but it is long last then the model with cord.
pt.6: same as pt. 1