Well, the Adobe Flash Player is used by about a billion and one people around the world. So you can expect a wide target audience. Unfortunately, not everyone visits sites like this one. So you might want to look for one that has heaps of traffic. This site, fortunately, can help you with that.
Another good thing is that this site also accepts games created by the Unity SDK. That’s used for 3D games as well, so might want to look into that. Sadly, I have heard people complain about the Unity engine.
You can also submit HTML games via the iframe method (you’ll know what it is if you’ve done HTML before; if you haven’t, it’s basically another way to embed stuff, in this case the HTML game.) I’ll leave it to you to decide.
As for the Maya export, I’ve heard of something called the "AS3GeomExporter"http://not-so-stupid.com/open-source/as3-geom-exporter-english/
that can handle that for you.
But the classes come out in a language called AGAL (Adobe Graphics Assembly Language), but that’s probably a good thing because, if implemented correctly, the 3D game will run faster.