Bonus taken out of rakeback?

[VLV]

I'm signed with FTP and a rake back affiliate and I understand that the bonus is taken out of my rakeback but I'm not quite sure what that means.

Does it mean that I will not be paid my first $600 in rake? Or does it mean I won't get any rake until my bonus clears?

And also as I understand the bonus is released in $20 instalements. Will I get that instantly or once a month from my affiliate?