Advice need - 15 questions

[Taedius]

1.2: The number I've seen is 5-10 seconds, to ensure that every horse has stopped charging.
2.2: Yes, slingers should not have friendly units in front of them when shooting.
4.1: Only units that are sitting still are hiding. Once they move, they're spotted. If you can get them behind hills, it's a different story (at least enemies behind hills tend to be invisible to me), but that's not an option on most maps. Too few hills around.

Edit: For more info the cavalry charge, and the use of cavalry in general, see Ibrahims excellent guide:
https://forums.totalwar.org/vb/showt...-using-cavalry..