Wow! I been away from this forum for two months. Anyway let's continue to your question.
The first thing you need to do is craft an original idea for the video animation intro you want. What I do is either create a written script or draw/storyboard the animation on paper and later create that using After Effects. Of course you need to dominate After Effects so you know if you have the effects/tools to make your intro.
If you like write your idea here to give you some feedback and a course of action.