Electrical question

[crusher]

Hi, I am scratch building a cat 330b, I have two track motors with two esc, do I use two channels for control or is there a better way. I am using an eight channel Futaba radio, it has several mixes available as well as several switches. I am slowly trying to absorb the manual for the radio. I have the boom, stick, bucket on the sticks using three channels to the valve body, the swing on a fourth channel. Also do I need to use a separate battery for the receiver, I have read somewhere that receiver power is received thru the esc connections?
Thanks for any help offered .
Terry