When you use Ready, you prepare an action or a move, not both. So, in the case of a familiar, a reaction spent channeling a spell excludes it from moving away from the target.
Can you prepare the dash action?
Yes you can. First, you decide what perceivable circumstance will trigger your reaction. Then, you choose the action you will take in response to that trigger, or you choose to move up to your speed in response to it.
Can you ready as a bonus action?
A bonus action can be taken only on your turn. You, therefore, can’t use Ready with a bonus action. #DnD.
Can you prepare a move or a ready action?
Update: To be clear, you can ready your move action instead of your action, but you cannot do both (thanks to J. A. Streich for pointing this out). Per Jeremy Crawford, official rules designer for 5e: When you use Ready, you prepare an action or a move, not both. 5e doesn’t use the terms “move action” or “free action” anymore.
Why do you always move on your turn?
You may always move a distance up to your speed on your turn without taking any actions (barring special conditions — but let’s not get into that!). That you can always move on your turn without taking actions means there is no “move action”. Because why would there be, if you can always do this anyway? In the PHB, page 192, it says:
What does it mean to move on your turn without taking action?
This means moving is not the same as taking an action. You may always move a distance up to your speed on your turn without taking any actions (barring special conditions — but let’s not get into that!). That you can always move on your turn without taking actions means there is no “move action”.
How does the ready action work in role playing?
The ready action is, as you point out, an action like any other. This means that on your turn you can move and take the ready action.
