You can use any of a number of ways to reveal the text. That’s super easy. You can use text animators, a mask, or even the Linear Wipe effect.
To get the burst of light, there’s CC Light Burst and another CC Light effect whose name I can’t recall that can get you a burst of light like that. You would just make the source point animate while you both wipe on and wipe off duplicate of your text layer. You could use a Circle effect with Stencil alpha as one way to just reveal a small portion of the text.
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