Noob questions: How do you micro archers?

Actually two noob questions:

1) When I try to dodge a mangonel, my archers first takes 10 seconds to regroup, then starts to move. By then they take the shot in their throat. How do you make them move left or right where they are without regrouping?

2) How do set so that when a new unit is created they will go into patrol mode while going to the gather point? Right now, my units ignore attack until they reach gather point even if at aggressive stance.