The switches you bought are quite a bit better then the ones I started out with. We had those little guys that come with the cheap flight packs and new radios. After I had one fail I went ahead and started using the heavy duty JR switches with the charge jacks and bigger wire. So far no problems with one of them. I have tried others and the switches were OK but the plastic cases were brittle and tended to break.
Bruce covered the batteries pretty good, Ionly use packs like the sub C for my bigger planes, that's a lot of weight to be dragging around for no real reason on a small 60 size plane. Ialso don't bother with the two packs on a smaller plane. After the 60 size I may use two depending on the plane itself but it's more about the extra cost and the type of plane. A nice warbird that I spent a lot of time building I would run two. Most the time.