How to do a Lockdown Pan Brushstroke Path Animation?

[Ashley5C61]

Hi, I am new to Adobe After Effects, having finished the tutorials offered by AE.

The idea I want to make is a ink / calligraphy animation that starts off with an ink droplet splashing and dispersing onto the composition, then a downward brush stroke emerges from the ink blot. Which draws downwards continuously.

Visual Diagram: 

I want the brush stroke to continuously flow down and the camera locks on and follows the travelling end of the brush stroke.
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I have the brush and ink blot set up already.
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The problem I am facing is:

I have no idea how to lock the camera onto the head brush stroke,
The continuous brush stroke goes past the composition boundary, and would get cut off.

[Mylenium]

You don't animate the camera, you just animate the stroke and ink blot. All that's required is a very tall pre-comp containing all the elements that can then be moved around in the parent comp. No need to make it more complicated than that.

Mylenium

[Ashley5C61]

Thank you 🙂