Charging receiver packs

[DaveG28]

Getting confused looking at receiver pack chargers/switch harnesses! Basically I need a receiver on/off switch and also a way to charge my receiver pack, but some advertised switches say they have charge leads too

Anyway:

1. Which channel do you plug on/off switches into?
2. What is a good lead to buy to charge the pack, all the one's I've found say they have a female plug, but surely the pack also does (as the receivers are male aren't they?)?