First, you guys will have to make a list of people for group 2. Ones that are not dedicated will not participate as the mains of group 2, although it would be very nice to switch them around when they are present.
On the healers side, there may be a healer or 2 moving from group 1 to help on group 2. Seems like many healers for group 2 are lacking participations, but we'll get it working eventually.
Don't give up! Kara doesn't happen easily. Expect lots of wipes and frustrations! Patience will bring you all the goods in Kara.