Ok, I have yet to do any pvp (my toons are in their 40s) I was wondering when you "join as a group" wow randomly places you in a setup for a raid. AV for example.

1) There are 40 toons in their, will your toons all be in say group 1-8 or will they be spread randomly?
2) If random how do you set them to follow and assist? will this work still if my toons are in different groups?