You don't want to use all your good material at the start for sure. You have to have something pretty good if it's worth posting more than twice a day. A priority with newbies is to comment on stuff they like to get noticed. Joining some communities may help too. We need to step in if we see them doing it wrong. We all benefit if they stick around.
!ENGAGE 20
I agree. Commenting is probably the single most important thing you can do at the start.