1. If the second unit charged against the same unit as the first one did, then both units move at the same time, one failed would not block the other.
1. If they were different units, then yeah, it blocks.
2. Normally you can't take a normal weapon and a magic one. If the extra hand weapon was legal, then you are right.
3. Your unit champ, banner, and musician always have to be in the front rank. If your rank was five wide, that would be 2 chars in front and two in the second rank. However, if at the start of combat, you want a char in the second rank to move up, he can make way.