Alot of this is in the RAF FAQ but since I know it here is the quick and skinny

Mounts: Only one character per account can get the mount, so you have to choose which one.
Granting Levels: Can only be done to characters that are of a lower level, so if your refered characters are level 60 they can grant 30 levels each to make any other character up to 60. But if you only get 4 of them to level 30, they will have 15 levels each but only be able to make a character up to level 30 (You could get two level 30s this way though).
Boosting a RAF: Not entirely possible the way you wuold think. I have a 5 accounts A and B are original accounts. I liked account C with A. I was unable to play a high level char on account A to get the RAF bonus on account B, I had to start over and keep the characters VERY close in level (2 away is too far, I think even one away is pushing it for the gaps). I have since added in accounts D and E (D linked to B and E linked to D) so that I can have a group of 5 noobs all at the same level running together (Which is what I am happily doing now)

In all honesty, If you are just getting into Multiboxing and RAFing them at the same time like I am I would recommend starting from scratch on all of them. I know you have a high level as I do that could run 4 of the lower accounts through their quests pretty quick but you are already getting ahuge boost in power cause you are multiboxing and a huge boost in XP cause of the RAF. start as noobs, level em all at the same time, so you max out your time in RAF. You will have a level 60 plus be able to be granted a level 60/30 ... It will give you more with the time you have.