I don't really keep track of the amount of strike outs I throw, but I remember getting about 7 K's through 5 innings with one of my pitchers. I think I usually get close to 10 k's per game.
The key is to change the eye level of the hitter. Work all four corners. Whatever combination of pitches, just vary your pitch location, and pitch speed.
Above the letter high strikes. Vary your pitch speed. Throw two fast ball pitches on the inside, follow that with an outside pitch above and away. Instead of a first pitch strike, consider throwing a curve ball in that situation. Three slow pitch change ups in a row, then a high pitch fast ball inside. Four straight high fast ball, then a low sinker on the inside. Two inside curve ball, curve ball, then slider away. Two high pitch fast ball inside, then a fast ball low and away. Anything to keep the batter on his heels. Keep them guessing, always.