You will want to use audio to keyframes and then drive opacity with an expression.
There are a bunch of ways to do this there are some really awful tutorials on how to do it on YouTube and one or two good ones.
My good friend Angie Taylor produce this extensive audio to keep frames tutorial using time remapping for lip-synch. It'll show you what is possible.
I get back to computer today I'll show you the expression I would use to drive opacity.
Thanks, I will have to do some research before I can figure out what all of that means as this is my first project, but I get the general idea... just not know where to find all the stuff and configurations,
The best place to start is here: Getting started with After Effects It may look like a lot of text, but it's the fastest (free) way to get up to speed in After Effects. AE has a LOT of foundational fundamentals that you really need to understand before you start working with it. The resources in that link should help.