I would start with HTML+CSS, then web design (designing website layouts in Illustrator or Photoshop).
I'm not familiar with animation, wouldn't After Effects be good for that?
You want to take a huge leap, remember how long it took you to learn AI + PS and gain all the knowledge and experience...
You can raise employee engagement by having managers or even employees write on a blog about various aspects of your business/department. You can also try designing a nice visual screensaver which portrays a positive image of the company.
Oh, and moodboards.
How to create mood boards: 40 pro...
And what would be your USP? Because there are already some websites that do something similar:
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