Well, what about hand strikes? I think that's a reasonable place to start...there's a whole family of related martial arts---karate in its Okinawan/Japanese/Korean versions, kempo/kendo (if you consider this separate from karate), and all of the vast variety of Chinese fighting systems---where the lion's share of combat applications take the form of hand strikes. So how do people involved in this thread train hand strikes---punches and open hand techniques? How do you use them to set up finishing moves? Do you punch for power or speed?... and I think most to the point, how do they fit into the overall strategy of your particular (substyle of your) martial art?
Hand strikes eh?
Okay here goes. To my mind striking has one of two purposes.
1. Disable the opponent (Primary objective)
2. Re-position the Opponent (Secondary Objective)
Disabling the opponent works on the basis of either shocking the Central Nervous System, or disabling a bodily function. Pain is not a reliable factor for disabling an opponent, so instead our focus should be on what sort of reaction does it cause?
Re-positioning the opponent is the secondary objective, moving them into to position to clinch and throw.
Even when re-positioning the opponent, disabling them takes precedence, so a strike to reposition should always be done in the manner of a strike to disable.
Don't have time to waste on ineffective strikes in a fight.
With regards what types of strikes to use, for self-defence I'd stick with open handed strikes for face, closed handed for the body.
And training them, start off getting the technique right, just doing the strikes slowly in the air, till you're comfortable with it, speed it up a little, just get used to the motion.
Then start doing pad-work, and bag drills, get used to hitting a solid target.
Then light striking drills with a partner practing this technique.
And then full contact free-form sparring where you try to ustilise these techniques.
I don't really like using strikes such as eye gouges, due to the inability to practice them full contact safely.