- Doesn’t matter, you can change the motor spinning direction with exchanging 2 wires
- correct, the other two are probably for powering the esc and to connect the remote should be declared in the esc datasheet
- check out the maytech one its pretty good, you can also support a guy here on the forum he developped his own remote with cool features, check New waterproof remote (Vincent’s build)
- the white connector on the battery is to observe every cell while charging or to put a beeper while using it so you know when its empty
- which one you mean ? google XT90, gold connector maybe this already helps
Hopefully this helped 