Get down on knees, lift front leg up with knee facing the catcher and put your glove on your knee.  Do full arm circle and snap at the bottom.  This basically takes your legs out of the picture and will show exactly what you are doing wrong.  Once you can throw strikes, get faster and faster to gain arm speed.

Stand facing toward the wall in your stride position (standing sideways). Take a ball and flick your ball straight to the wall and it should come right back to you. Only use you wrist no windmill. Then stand 6ft away from a wall in your stride position and just do your windmill do not close your hips, the ball should come right back to you, time yourself for 15 seconds and see how many you can do. Every time you do it see if you can get more than the time before.

Long Toss, This is not my personal favorite, only because I do not feel that this drill is meant for everyone.  However, if this drill is meant for you it is one of my favorites, if that makes sense.  Pitch from your regular distance.  Back up about 4 feet and pitch backing up after 3 pitches per 4 feet.  Back up until you cannot make the pitch to your catcher.  Then start moving forward 4 feet, 2 pitches per move until you get to regular distance. 

Try dragging the inside of your foot from toe to heel.  This will make your hip stay tucked back, and it can help get you straight on the power line.

Draw a line in the dirt to resemble a pitching rubber, if you don't have one.  Jump as far out as you can, putting a line where you land.  Go back to the original line you drew or to the pitching rubber and try to jump past the line you see in front of you.  Do that over and over trying to beat the line and your feet will eventually remember how to jump. 

Put your feet on the pitching rubber, Draw a straight line to your catcher from your right foot.  When you jump out, your left foot should be on the line at 45 degrees.  Never be too far left or too far right.