Definitely start by training the secondary skills, PA and OD. These are hard to train because you need to play your PF/C trainees at guard, but since you're tanking that wouldn't matter. You'll be real glad to get that out of the way as soon as possible. It's great that the first 2 guys already have 6-7 OD, so I'd train that to 9-10. And then passing until nr 2 is at 7 and nr 1 is at 9. Train some 1v1 forwards every now and then to keep HA/DR on the same level as OD and PA.
Then when OD/PA/HA/DR are around 7-9, start training inside skills the way you like it. Starting with ID is a smart thing to do.