I do not use AE personally, but I know that one can apply glow effects are very similar to the way it is done in PhotoShop. There are glow settings available and you can key in on a desired color and apply a glow to it.
Ok, that's a really short and quick nutshell version, but that's all there is to it. The rest is getting to know your FX application and learning how to best utilize it and get clean mattes and keying, etc. You may not start off with something you find spectacular - getting clean FX can be tricky. That is something you'll need to experiment with and learn through experimentation. That is how I do what I do - experiment until I like the effect. I often learn new effects I wasn't even thinking about in the process too
Just remember - anyone can generate some basic FX. But it takes time and patience to learn how to craft the really cool stuff. Time to learn it, and time to apply it properly. Of course in time, you'll be able to pull it off more efficiently as well. Just experiment and have fun with it. That's the best advice I could probably give.
Oh, and be sure to post your experiments for us here if you don't mind sharing.