If you name your animations something like:
Low Punch (or LP)
High Kick (HK)
So if you know that the High Kick is, say, 8 frames, you can easily choose a specific frame within that animation.
You would only have to specify; animation HK, frame X. Or just use, "is animation HK finished", then "set animation Stance".
Edit: And as for sheets/frames, I would probably make a sheet for each animation move, for easy importation. You can import several frames into an animation though, so that'll work fine too.