Questions of starting player group

[RichardH]

He guys,
We just started this great game but a few question came up wenn playing.

why do you choose a leader? What does it bring to the game except the ammount of tactical cards you may choose?

Can someone get out of close combat? Or is one locked till someone dies?

Can you only use the misision and tactical card out of the starter or can you use all cards if they are not fraction bound?

More question will come, but its a really great game, some shots of our first game is the also on this forum, we made a gaming board especially for this game :-)