They probably need to be delegated at least up to 30 SP each, 50 would have fewer issues though. To have no issues...I don't know.

Even 10 SP each would be enough to let them post more often though. For that, you don't need a whale. Even a minnow of a few months old likely has 10 SP to spare.

I wish you luck. You'll likely need it.

I would suggest they watch their bandwidth on steemd. There are times when they can post likely. Your steemd would be the following, for example:
https://steemd.com/@chloeroy

I personally think you need to show that they're worthy of delegation though. At least link to their profiles, if not have them each do posts as to why they deserve delegation, and what they will bring to steemit.